Massy — The Gymnosomatous Pteropoda of the Coasts of Ireland. 235 



being more than twice the length of the largest lateral teeth. At least 

 fourteen were counted, and they were probably more numerous, but they 

 have escaped from their sacs, and are scattered amongst the teeth and 

 suckers. Jaw spines (fig. 2 c) very variable in size and shape. Posterior 

 gill present, but too lacerated for description. The viscera have almost 

 entirely disappeared through a large rent in the right side, and in con- 

 sequence of this injury it is impossible to say if a lateral gill was present. 

 Length, 13 mm. ; breadth, 6 mm. Colour, bluish-white. It is very regret- 

 table that this specimen is in such bad condition ; and, unfortunately, the 

 radula, on being boiled in caustic potash, came asunder; and the number of 

 lateral teeth is based on assumption from their size. In many ways this 

 specimen resembles Schizobrachium polycotylum, Meisenheimer ; but that 

 species has only two denticles in the median tooth, which is also much 

 smaller in proportion to the lateral teeth than in the present species, at least 

 six median teeth of which are in a good position for observation, and all 

 show the wide shape, and three similar-sized denticles of Spongeobranchaea. 

 Histologically the integument displays large round cells, with an opening in 

 the centre, and a great number of oval, dermal glands, of much smaller size 

 than the cells. 



Family CLIONOPSIDAE. 



Clionopsis longecirrata, sp. n. 



(Plate VIII, fig. 3.) 



S.E. 481— Midwater otter trawl, at 600-900 fathoms. Two. 



These specimens measure 3 mm. in length, and have a round, smooth, un- 

 pigmented body without ciliated bands (PI. viii, fig. 3 a). The only buccal 

 appendages visible are two narrow nuchal tentacles exceeding the body in 

 length ; originating from a collar-like ridge at the back of the neck, they are 

 widest at base, unbranched, and taper distally to fine points. Fins very 

 broad and rounded distally, the left being the smallest in each specimen ; at 

 the posterior margin of the base of the fins a small projection is apparent, 

 and would seem to be a posterior lobe to the foot, as a sort of muscular track 

 can be traced from it across the relatively vast expanse of fins to the minute 

 anterior lobes of the foot situated at the anterior fin-margin. No lateral 

 gill ; a posterior gill is present. Whether it is quadrangular cannot be 

 ascertained, but lateral keels are certainly present in both specimens, and 

 there seems to be a circular ring also. Eadula ; 3-1-3, relatively enormous; 

 median tooth (fig. 3 c) slightly curved and with edge serrated almost 

 throughout its length with forty to fifty short denticles of varying size, the 

 extreme ends alone being smooth : lateral teeth (fig. 3 b) long with broad 



