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SOME ACCOUNT OF THE ANATOMY OF CASSIDARIA^ RUGOSA 



(LINN.). 



By Alexander Reynell. 



Mead 14U April, 1905. 



PLATE XV. 



For the opportunity of examining; the anatomy of this animal I am 

 indebted to the kindness of Mr. Sykes, from whom I received it on 

 the 14th June, 1904, it being trawled from a depth of 200 fathoms off 

 the south-west coast of Ireland. 



The animal, a full-grown male, was preserved in a solution of 

 formaldehyde and much retracted in its shell. I was fortunate 

 enough, however, in extracting it entire. The foot was rolled 

 together, and the proboscis and tentacles partially retracted. I cannot 

 tind that the general anatomy of this species in its entirety has ever 

 been described, though it must be pretty well known. 



Kiener in his monograph of this genus gives some description of the 

 animal and the anatomy of the paliial complex. I really cannot agree 

 with his colouring of the animal, he making the colour of the foot and 

 visible portion of the animal olive green, whereas, according to its 

 captor, the colour of this specimen, when living, " was pale grey, 

 much like the foot of a whelk," and, as preserved, the foot, head, 

 and tentacles were of a pale yellowish pink colour, much like what is 

 conventionally known as ' flesh colour,' the only pigmented portions 

 being the proboscis and eyes. 



Dr. jST. Tiberi, in his paper " Sur les especes du genre Cassidaria 

 qui vivent dans la M editerranee " (Journal de Conchyliologie, ser. iir, 

 vol. iii, 1863), mentions this species, as figured by Kiener, and finds 

 fault with his colouring. 



Fischer gives some account and a figui'e of the liver of this species 

 in his paper on the morphology of the liver of Gastropods. F. Bernard, 

 in his beautifully illustrated paper, describing his researches on the 

 paliial organs, minutely describes the osphradium and ctenidium. 



Perrier gives a full account of the anatomy and histology of the 

 renal organs in his paper on these organs in Prosobranchs ; this, again, 

 is beautifully illustrated. Finally, there are some notes on the 

 anatomy of this species to be found in part ii of Dr. Arnold Lang's 

 "Textbook of Invertebrate Comparative Anatomy." 



The foot (section. Fig. 4, F.). Solid and substantial, rounded 

 posteriorly, notched anteriorly, and the edge divided into an upper 

 and lower lip, between and in the centre of which the anterior 

 pedal gland opens {L.S. and PM., Fig. 4). This gland takes the 



\_Morio, Montf ort, is an older name. — Ed.] 



