338 On so7ne neio and peculiar ^[oUusca. 



although all the specimens consisted of fragments only, the 

 species is very distinct and peculiar. 



Limacina helicoides*, Jcffr. 



Shell like a reversed Helios nemoralis, extremely thin, 

 opaque, brittle, and glossy : sculpture, a few delicate spiral 

 stria?, and close-set microscopic lines of growth : colour 

 brownish-yellow : spi7'e depressed, not flat : whorls 4, rather 

 convex : suture slight but distinct : mouth irregularly and 

 narrowly oval, rounded on the outside, acute-angled above, 

 and pointed below : pillar twisted, furnished at its base a 

 little way inside with a sharp and curved ridge, which corre- 

 sponds with a keel on the outside : umbilicus none. L. 0*5. 

 B. 0-4. 



Station 12, 1450 fms. ' Porcupine ' Expedition, 1869, 

 west of Ireland, 1215 fms. : 1870, Bay of Biscay, 740-1095 

 fms. 



ClionidsB. 



Clione borealis, Pallas. 



Clione borealis, Pallas, Spic. Zool. x. p. 28, t. i. f. 18, 19 (1774). 



Body long and slender, pinkish or reddish-brown about the 

 front and tail ; liver brown ; the middle portion and the rest 

 of the body are gelatinous and veined lengthwise ; the whole 

 surface is irregularly covered with microscopic tubercles : 

 head transversely oval, separated from the middle of the body 

 by a short and thick neck ; it is furnished with 6 bulbous 

 processes (3 on each side), which are of a bright pink colour; 

 these are plain and not armed with suckers or cups, and they 

 do not project beyond thie head : mouth semiglobular, the lips 

 being placed lengthwise : tentacles 2, projecting like horns on 

 each side of the head at the top ; they are conical and finely 

 pointed, reti-actile within sheaths, as in Doris, not armed with 

 any suckers : eyes none : fins or foot-lobes 2, broad, leaf- 

 shaped, membranous, and delicately reticulated ; below the fins 

 are two appendages, which may serve as a second or lower 

 pair of tentacles ; these appendages are triangular, and folded 

 close to the body, where they assume the shape of a human 

 heart: ^az7 pinched up, and ending in a fine point; it is speckled 

 with minute black dots. Very active and hardy, unceasingly 

 flapping its fins and wriggling its tail, by means of which it 

 swims rapidly. My account does not agree with any of the 

 descriptions and figures of this remarkable mollusk as given 



* Resemblino' a Helix. 



