GASTEROPODA PECTJNIBRANCHIATA. 63 



raoged on the roof of the cavity, and its filaments arc frequently very 

 long. 



CAPIT.I s, Monlf. PILKOPSIS, Lam. 



A conical shell with a recurved and spiral summit; which has long 



ed it to hi- plan (1 aiming the Pat. II;,- : the l>rauchiae arc in one 



<der the interior margin of the branchial cavity ; the pro- 



l-'iiy, and there is a closely plaited membranous veil under 



the neck: .. of the conical tentacula*. 



HIPPONYX, Defr. 



Would appear from the shell to be a fossil Capulus, very remark - 

 . for u bed formed of calcareous matter, on which it 

 P, and which probably exuded from the foot of the animal \. 



CREPIDII.A, Lam. 



hell oval, with an obtuse horizontal point, directed obliquely 



backwards and laterally; the aperture forming the base of the shell, 



which is half closed beneath and behind by a horizontal plate. The 



.1 >ae which contains the viscera is on this plate, the foot 



ath, and the head and branchiae forwards. The latter consist of 



a range of long fil;. ; : ached under the anterior margin of the. 



branchial e.ivity. The eyes are at the external base of two conical 



ula J. The genus 



PII.KOLUS, Sower by, 



ars to consist of Crepiduloe, in which the transverse plate occu- 

 lialf the aperture; their shell, however, is more like that of a 

 Patella . They are only found fossil. 



SEPT\KI\, Fcr. NAVICELLA, Lam. CIMBER, Montf.,8'2. 



The shell resembles a Crepidula, except that the summit is symme- 

 trical and laid on the posterior margin, and that the horizontal plate is 

 less salient. The animal is also provided with an additional, irre- 

 gularly shaped, testaceous plate, horizontally connected with the 

 superior surface of the muscular disk of its foot, and covered by the 

 .initial sac, which it partially supports. It is probably analogous 

 to an OJMK ulum, but does not exercise its functions, being, in a 

 measure, situated internally. The animal has long tentacula, at 



Pattlla hungarica. List., 544 32 ; Pat. calyplra, Chemn., X, clxix, 1643 

 44 ; Pat. ntifntlu, Gin., List., cxliv, 31. 

 f r.itclla cornucopia-, Lain., Knorr., Petrif., II, part ii, pi. 131, f. 3, andBlainv., 



J Pafrlla fornitatat List. 545, 33, 35 ; P. aculcata, Chemn., X, clxviii, 1624 

 25 ;/'. r?orrenm, M iUui, I. xi:i, i :;i, i .J2 ; P. solea, Naturf., XVIII, ii, 15; 

 ms. Sencg., I, ii, <j ; P.porcellana, List., 545, 34. 



Pit,-,,!,,* plintus, Sowcrli. ; PiU teris, Id., Genera of Shells, No. IX -. A.'. 

 tcritaUtes, Dwh., Ann. des Sc. Nat., T, xiu, 3, c, b, c. 



