KEPORT ON THE MAKSENIAD^E.j 19 



freely in the lower body-cavity ; the penis most nearly resembles tbat of the Marsenice 

 proper. The shell is also, on the whole, like that of the typical Marsenise. 



The only representatives of the genus, as yet known, are the two new South Sea 1 

 species about to be described. 



1. Marseniopsispa.cif.ca, n. sp. (PI. I. figs. 7-27). 

 Habitat. — Southern Ocean (Kerguelen Island). 



Only one representative (female) of the species was obtained, by the dredge between 

 10 and 100 fathoms. 



In its preserved state the animal measured 18 mm. in length, 13 "5 in breadth, and 12 

 in height. The foot had a length of 13, and a breadth of mostly about 5*5 mm., increasing 

 to 8 in front. The length of the tail was 6 mm., and that of the tentacles 4 mm. The 

 colour of the upper surface was reddish yellow with several almost purple-red spots, and 

 also apparently with scattered white nodules ; the under surface of the animal was 

 yellowish white. 



The back was covered with coarse tubercles, very much as in the Onchidiopsides, 

 which this form on the whole resembled. The respiratory canal measured 4-5 mm., 

 was anteriorly bent slightly upwards, but otherwise exhibited the usual characters. The 

 mantle border was thick, swollen, and not very broad. The ordinary stripes round the base 

 of the foot were absent ; the foot was as usual, except that the furrow of the anterior margin 

 was very strongly developed, especially towards the middle line, where a slit-like hole was 

 formed. The head and tentacles exhibited the ordinary form. The shell and the viscera 

 were indistinctly seen as a greyish mass shining through the dorsal surface. The inside 

 of the mantle, adjacent to the shell, was almost white. The shell (fig. 7) measured 15 mm. 

 in length, about 12 in breadth, and 10 in height. The spiral was small, and exhibited 

 two turns ; the last turn was very large and much vaulted. Through the thin calcareous 

 shell was seen the dark-grey coating of the superior visceral mass. 



After removing the shell and the enveloping coat, the superior viscera exhibited the 

 following arrangement (fig. 8). Far back lay the large, whitish, apparently granular 

 ovary (fig. 8, a) ; in front of this was situated the large, very faint greenish-grey foliated 

 gland (fig. 8, b), and across the lower surface of the latter the whitish intestine could be 

 seen. Further forward to the right lay the faint yellow mucus- and albumen-gland, with 

 the white rectum along the left side ; both rectum and gland extended forwards. To the 

 left was seen the roof of the branchial cavity, apparently of a white colour, owing to the 

 presence of the secreted substance (fig. 8, d) of the kidney or of the foliated gland. Before 



1 According to a note which. I made in 1873, in the British Museum, there is a specimen there, obtained in 

 " Sholl Bay, Strait of Magellan," which might, perhaps, belong to this genus. 



