Mr. E. J. Miers on the Squillidae. 19 



one of which bears Leach's MS. label, bear a very great 

 resemblance to 8. scorpio, but differ in the following particu- 

 lars : — The median longitudinal carina of the carapace is 

 bipartite posterior to the cervical suture ; there is a distinct 

 median dorsal carinule on each of the exposed thoracic and 

 first to sixth postabdominal segments, which, however, does 

 not reach to the anterior or posterior margin of the segment ; 

 the anterior of the exposed thoracic segments is laterally acute, 

 but not curved and produced as in 8. scorpio ; and the two 

 following segments are laterally truncated. Length about 

 3 inches. 



Hob. Unknown. 



One of the specimens (the one bearing Leach's label) is a 

 male ; but the carina? of the penultimate and terminal post- 

 abdominal segments are not thickened as in 8. scorpio. 



SquiUa prasinolineata ? 

 (PI. II. fig. 10.) 



? SquiUa prasinolineata, Dana, Crust. U.S. Expl. Exped. xiii. p. 620, 

 pi. xli. fig. 3 (1852). 



To this species I doubtfully refer a female SquiUa in the 

 Museum collection that is evidently very closely allied to both 

 the preceding species. Its chief distinctive characters are as 

 follows : — The rostrum is proportionally somewhat broader 

 than in either of the foregoing species. The median longi- 

 tudinal carina of the carapace is indistinctly furcate only in 

 its anterior portion ; the cervical suture is faintly marked ; 

 the median carinules of the exposed thoracic and first to 

 sixth postabdominal segments are obsolete ; the first exposed 

 thoracic segment is laterally produced into a short acute 

 process, which is not so much curved as in 8. scorpio ; the two 

 following segments are also shortly laterally produced and acute, 

 the terminal postabdominal segment is proportionally nar- 

 rower and more elongated than in either 8. scorpio or 8. 

 Dufresnii ; there are about six small rounded lobes between 

 the submedian marginal spines, and between these and the 

 first lateral marginal spines. The distal prolongation of the 

 basal portion of the uropoda terminates in two unequal spines, 

 the inner of which has a small rounded tooth on its inner 

 margin. Length 2f inches. 



Hab. Brazil. 



I refer this specimen with some hesitation to S. prasi- 

 nolineata, as Dana does not mention the acute lateral 

 prolongations of the posterior thoracic segments, and de- 

 scribes the upper surface of the terminal postabdominal seg- 



2* 



