TURRITELLA 



Specicis 16. (Fig. a and b, Mus. Cuming.) 



TURRITELLA BREVIALIS. 



For description of this Lamarckian species see Genus 

 Mesalia, Gray, immediately following the present. 

 For Sp. K;, see PL X. 



Species 17. (Mus. Cuming.) 



TURRITELLA TRisuLCATA. Turr. testa, aamhiato-turritd, 

 anfractibus ad octodeeim, tramversim conspicue iri- 

 costatis, costis dMantibits, sulcis intermediis excavatia ; 

 alb'idd, apicem versus viulascetde, flamnudis perpaiicis 

 irregularibus aumniio-f/iscis oblique pictd. 



The three-grooved Tdrritella. SheU acuminately 

 turreted, whorls about eighteen in number, trans- 

 versely conspicuously three-ribbed, ribs distant, inter- 

 mediate grooves hollowed ; whitish, tinged with violet 

 towards the apex, obliquely painted with a very few 

 irregular orange-brown flames. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. ix. p. 2,50. 



Hah. Eed Sea ; Kiener. 



The only species which is prominently three-rilibed. The 



painting is well characterized by Lamarck in the words, "ses 



flammules sont eparses." 



Species 18. (Mus. Cuming.) 



TURRITELLA ANNULATA. Turr. testd lanceolato-turritd, 

 anfractibus viglnti, spiraliter striaiis, sicperne declivi- 

 bus, deinde concavis et bicarinatis, carinis apertiiram 

 versus distaidioribus, evaiiesceuiioribus, et iiderdiii/i 

 dupUcalis ; fulvo-spadiced, loiujitudimliter obscure 

 albinebulatd. 



The RINGED TURRITELLA. Shell lauccolately turreted, 

 whorls twenty in nimiber, spirally striated, slanting 

 round the upper part, then concave and two-keeled, 

 keels becoming gradually more distant, towards the 

 apertiu-e, fainter, and sometimes duplicate ; fulvous- 

 bay, longitudinally obscm-ely clouded with white. 



Kiener, Icon. coq. viv.p. 20. pi. 13. f 1. 



Hub. Mouth of the Gambia, West Africa. 



In the first ten whorls of this species, according to the 



specimen before me, the whorls are prominently developed 



and contiguous ; after this period of its growth they become 



May, 



gradually fainter and more distant, separating at length 

 into two faint rida-es. 



Species 10. {.Mus. Cuming.) 

 TURRITELLA VARIEG.VTA. Turr. 1,'^ld puniuilJull-turritd, 

 anfractibus quindecim. ad ■■~r,/,ri„,. j,rr/,iiiin.^ jirimis 

 superue decUvibus, inferm: i-.i-ciinilns^ cflcrix plnno-con- 

 cavis, supra suturas tumidiusculis, slriis coifertis li- 

 risque quaiuor vet quinque subtilibus, distanMbus, inter- 

 dum obsolete granulosis, citujulalis ; albiddvel jmrpuras- 

 ceide-spadiced, rufo-fusco punctata et longdudlnaliter 

 variegata, liris hderduvi fusco alboque articulatis, 

 aperturcefauce purpurascetde. 

 The VARIEGATED TuRRiTELLA. Shell pyramidally tur- 

 reted, whorls fifteen to sixteen in number, the first few 

 slanting round the upper part, excavated beneath, the 

 rest flatly concave, rather swollen above the sutures, 

 encircled with four or five distant sometimes obso- 

 letely granulated ridges ; whitish or purple-tinged 

 fawn, dotted and longitudinally variegated with red- 

 brown, ridges sometimes articulated with brown and 

 white, interior of the aperture purplish. 

 Turbo variegatus, Linn. Syst. Nat. (12th. edit. )p. 124(1. 

 Turritella imbricata, Lamarck. 

 Var. elongata. Turbo imbricatus, Linnajus. 

 Ilab. Island of Margarita, West Indies ; Dr. liornbcck. 



The original type of the Turbo variegatus in the Linnsan 

 collection is a shell of immature growth, but extremely 

 well characterized and higldy coloured. The shell which 

 served for Linna;us's Turbo imbricatus is, on the contrary, 

 in the worst possible condition, perfectly bleached, and 

 only retaining a sufficient amount of sculptiu-e to identify 

 it with the elongated variety represented by Kiener at 

 PL IX. fig. 2 a. A comparison of these shells with speci- 

 mens in Mr. Cuming's collection and in the British 

 Museum (for one of which illustrative of the elongated 

 variety, see PL IX. fig. 19 i) has enabled me to determine 

 their affinity with satisfaction ; and the name variegatus 

 should be used in preference to that adopted by Lamarck, 

 from the fact of its being a more ajiijrojjriatc one, and that 

 which was assigned by Liunxus to the species in its normal 

 form and cundilidii. 



Si.rrics 20. (Mus. Cuming.) 

 Turritella uicinoulata. Turr. testa acuminato-turritd, 

 anfractibus octodeeim, subliliter stria tis, superne de- 



1S4.9. 



