MOLLUSCA. 775 



Sp. Tiedemannia neapolitana V. BENED., proboscis slender, pinnae with 

 white and yellow spots at the margin. Length 2 or 3". See GEGENBAUB 

 1. 1. s. 54 68 for the anatomy and development, gen. char. p. 212.] 



Family II. Clioidea. Naked Pteropods, with head distinct. 

 [The small foot on the ventral surface never connate with pinnae. 

 GEGENB.] 



Pneumodermon Cuv. Two small pinnae at the sides of neck 

 with an intermediate grooved conical appendage. Mouth with 

 numerous pediculated retractile suckers. 



Sp. Pneumodermon Peronii Cuv., Ann. du Mus. TV. PI. 59 B, BLAINV. Maine. 

 PI. 46, fig. 4 ; this animal was discovered in the Atlantic Ocean by P^RON, 

 and appears to differ from that figured by QUOY and GAIMARD in the 

 voyage of the Astrolabe (copied in Cuv. R. ani., ed. ill, Mollusq. PI. 17, 

 fig. 2), where the suckers stand like branches on two pedicles. Pneumo- 

 dermon violaceum D'ORBIGNY has a greater resemblance to it, the anatomy 

 of which has been given by V. BENEDEN with figures in MUELLER'S ArcUv, 



1838, pp. 296304, PI. IX. X. There is still uncertainty respecting the 

 respiratory organs, and the name PNEUMODERMON rests perhaps on a 

 mistake. [Pn. ciliatum GEGENB., see the anatomy, &c. 1. 1. s. 74 100. 

 The folds of the integument, here absent, which serve for respiration, are 

 described in Pn. violaceum and P. Mediterraneum, pp. 85, 86.] 



SpongiobroMcJiea D'ORB. (Is this genus distinct from the pre- 

 ceding 1) 



D'ORBIGNY Voyage dans I'Amfr. mtrid. (transferred to OKEN'S Isis, 



1839, s - 49 8 > Tab ! IX ' %s. i 9). 



Clio L., Clione PALL., ESCHRICHT. Body oblong, acuminate 

 posteriorly. Head distinct from body by stricture, covered by a 

 bilobed hood, crowned by six conical appendages, and two retractile 

 conical tentacles. Two oval pinnae at the sides of neck. Two 

 black points (eyes) in the back of neck. Two genital apertures at 

 the right of the ventral side, the anterior in front of pinnse for 

 the exit of a very large penis, the posterior behind the pinnse 

 for the oviduct. Anus behind these orifices, more in the middle. 



Sp. Clio borealis GMEL., Clione borealis PALL., Spic. Zool. x. Tab. I. figs. 

 1 8, 19, CUVIER Ann. du Mus. i. pp. 242 250, PI. 17, D. F. ESCHRICHT 

 Kongl. DansJce Vetenslc. SelsTcabs Afhandl. Kjobenhavn, 1838 (published 

 separately in German, Anatom. Untersuckungen u. d. Cl. boreal. Kopen- 

 hagen, 1838, 4to.) The six conical arms of the head are beset with spots, 

 microscopic suckers. This animal (Whale-bait), Clio limacina PHIPPS, 

 lives with Clio kelicina principally in the neighbourhood of Greenland and 

 Spitzbergen, and forms the chief food of northern whales, although scarcely 

 i" long. CUVIER regarded the fin-like appendages as respiratory organs, but 



