UI 



KNCUINITES. 



KNCKINITES. 



. ArimnrrimHa triatnnlaiarlyha (reduced) ; , body of the lame (natural 

 rise). (Miller and BncUand.) 



E. faryofhyUnlut, E. nil/on*, . compram, E. pyri/ormit. monili- 

 formi,, and . //o/eri. (Monster.) 



Solanoerinita (Ooldfun). Column very ihort, pentagonal, per- 

 forated by a pentagonal canal, radiate-rugose at the base, depressed or 

 hollowed out at the ride* by. the glenoid cavities of the auxiliary 

 amn, articulated with the pelvio by (lightly prominent ray* which 

 are trochitic and coadunate. Pelvis with five articulation*. Scapulae, 

 arm* (f). Auxiliary armi of the column thick and close-set. (Oold- 

 fuss.) 



latin (Ooldfun), with a turbinated column, 10 or 15-ribbed 

 longitudinally; articulation* of the pclvin linear. Silicified. It in 

 found at Wurtcmbcrg in Jurassic Limestone. (Ooldfuan). 



If. Ooldfuat describe* two other ipecie*, 8. Korbiculatut (MUnrter), 

 and S. Jatgeri (oalcareotu) (Qoldfuss), from the Juraaiic Limestone. 

 Baireuth. 



Coryofrinittt (Say). Pelvis of four plate*. CoiUl plate* tiz. 

 Column not dilated. Alimentary canal round. Articulating *urface 

 of the columnar joint* radiated. Auxiliary lide-arm* cylindrical and 

 placed irregularly. 



C. ornatn. Costal*, four pentagonal and two hexagonal. Column 

 Inserted Into a cavity at the bane of the pelvi*. Pelvu rather large ; 

 two of the plate* quadrangular, attenuated to the base, where they 



are truncated and a little recurred at the junction with the column ; 

 disc*, particularly toward* the base, granulated, with a distinct 

 elevated interrupted line ; two remaining plate* pentangular, atten- 

 uated to the base where they are truncated and a little recurved at 

 the junction with the column ; dice with elevated granule*, and with 

 two elevated interrupted linen extending to the terminal angles. 

 Costal*, four pentagonal and two hexagonal, all with elevated inter- 

 rupted lines, radiating from the centre to the angles, with a series 

 of truncated granule* on each aide and a few granule* in the inter- 

 vening spaces; intancapulars, two hexagonal, situated immediately 

 above the hexagonal costal*; scapular* six pentagonal, the upper 

 sides of which are more or less irregular by projecting a little between 

 the scapula, all with prominent linen granulated, similar to those of 

 the preceding. Arms six. Capital plates with a heptagonal one in 

 the middle, surrounded by five heptagons! plates and two irregular 

 ones at the mouth. Month not prominent, situated on one aide of 

 the middle, a little within the line of the arms, closed by small 

 valvular pieces, its inferior side resting on the superior angle of one 

 of the scapulars. Longitudinal diameter from three-quarters to one 

 inch and a half ; transverse diameter from seven-tenths to one inch 

 and two-fifth*. Mr. Say, who gives this description, records and 

 describes another species with one of the centals hexagonal, namely 

 C. loricatiu. It was found by Dr. Bigsby loose in brown clay at the 

 foot of the ravine at Lockport, in which the New York Canal mounts 

 the parallel ridge of Lake Ontario. 



Martupitct, Mantell (Martupiocrintia, De Blainville). Body 

 regular, oval, bursiform, rounded at the dorsal extremity, truncated 

 and flattened at the other, enveloped in a sort of shell or test com- 

 posed of great polygonal plates, articulated to each other, one cen- 

 trodoraal, and three rows superposed, of which the terminal one 

 supports ten simple rays. Mouth in the midst of four squamiform 

 pieces. Stem none. This is De Blainville's character. The following 

 is Miller's : " An unattached animal with a subgloboee body con- 

 taining the viscera protected by calcareous plates, of which tnat in 

 the centre at the base is angular, having a series of costal plates resting 

 on it, admitting intercostals at their superior angles, these giving 

 insertion to the scapula' from which the arms proceed. Space between 

 the scapulae covered by an integument, protected by numerous small 

 plates. 



M. ornatut, Ornamented Purse-like Animal (Miller), Tortoise 

 Encrinite (Parkinson). A purse-like animal, having the central plate 

 at the base of its subgloboae body containing the viscera ; pentagonal, 

 supporting at its edge five similar costals, which admit at their supe- 

 rior angles five hexagonal intercostals, into the angles of which five 

 scapula: are inserted sending off the arms. All the plates ornamented 

 by ridges proceeding from tile centre, and forming angular markings 

 near the corners. It is found at Off ham Chalk-Pits near Lewes; 

 Clayton Chalk-Pita, Hurstperpoint, Sussex ; Preston Chalk-Pits, near 

 Brighton (Mantell) ; Chalk-Pits of Kent, and Chalk-Pits, near War- 

 minster. (Miller.) 



Mr. Miller does not admit Martv.pitet among the Crinoidta, but 

 considers it as the immediate link between that family and Euryalt. 



Pentremita (Say). Column cylindrical, perforated; segment* 

 articulating by radiated surfaces, with cylindrical side-arms at irre- 

 gular intervals ; pelvis of three unequal pieces, two pentagonal and 

 one tetragonal ; scapula) large, very profoundly emarginate for the 

 reception of the lips of the radiating ambulacra, obliquely truncated 

 at the extremities on each side for the reception of one side of a sub- 

 rhomboidal plate or interscapular ; ambulacra five, radiating from the 

 summit, and terminating at the tips of the emargiuations of the 

 scapula) : each with a longitudinal indented line, and numerous 

 transverse stria; which terminate in a marginal series of pores, for the 

 transmission of respiratory tube* ; summit with five rounded openings 

 (ovaries) and an ongulated central one (mouth anil anus). (Say.) 



"This singular genus," observe* M. Say, "is so remotely allied to 

 any hitherto discovered, that I do not think it can, with propriety, be 

 referred to any family yet instituted. By its columnar support it is 

 related to the family Crinoidea; but the total absence of arms and 

 hands excludes it from that very natural group. The superior termi- 

 nation, in which the ambulacra, the rounded openings, and the 

 central angulated one, are situated, has some affinity to the family 

 Kckinulrti [EcRlitlc jsj, but the columnar support shows that it cannot 

 be arranged there. Having thus on it* inferior portion a resemblance 

 to the Crinoidta, and on its superior surface a decided analogy to the 

 Krhinitlta, I think it may with propriety form an intermediate family 

 under the following name and characters : Family, Rliutoidea. Column 

 composed of numerous articulating segments, supporting at ite summit 

 a number of plates, so united a* to form a calyciform body containing 

 the viscera ; arm* none ; branchiic arranged in ambulacra. In a 

 natural series their bodies constitute the link between the Crinoidta 

 and the Schinidea, on the one hand ; whilst, on the other, the 

 former is unquestionably, but not more obviously, connected with the 

 fUelltridifa by the unequivocal intervention of Comalula and Mnrm- 

 jiita. Of all the genera of Orinoidea, it is to Platycrinitt* that 

 Pentremite seems most closely related." 



M. Say describes three species, namely P. globona, brought from 

 England, and said to have been found in the vicinity of Bath ; and 

 P. pyrifurmi* and P. Jtorcalit, from Kentucky. He gives, as the 



