62 Transaclion.s. — Zooloyi/. 



-G. M. Thomson has kindly lent me his type of Sqicilla tridoi- 

 tata and a specimen obtained at Waipapa Point by J. F. Erec- 

 son ; and Mr. T. W. Kirk has been good enough to send me 

 specimens of his SqiiiUa indefensa. I am thus able to give the 

 synonyms mentioned above with perfect confidence : indeed, 

 this might almost have been done from the descriptions alone, 

 as there is little difference between them, except with, regard 

 to the number of teeth on. the dactylos of the raptorial limbs ; 

 and this is evidently subject to some variation, as Miers has 

 already pointed out in some other species. One of my speci- 

 mens, a male 3'68in. in length, has twelve teeth (without the 

 terminal spine) on the left side and thirteen on the right ; the 

 other specimen, a female, has lost the raptorial limbs. Squilla 

 Icevis, Hutton (type-specimen), has twelve teeth (exclusive of 

 the extremity) ; Squilla Indefensa, Kirk (type-specimen), has 

 nine (exclusive of the extremity) ; Coronis spinosa, Wood- 

 Mason, is described as " ten-toothed," while Miers describes 

 Coronis tricarlnata, Gray, which I have no doubt belongs to 

 this species, as having nine teeth including the terminal spine. 

 Thomson's type-specimen of Squilla tridentata has only three 

 teeth (four if we include the terminal spine) ; but it is very 

 small — only 0-75in. long — and is evidently a young form : in the 

 structure of the telson and in all other points it agrees closely 

 with the other specimens. 



Squilla kevis, Hutton, has, of course, no connection with 

 Squilla Icevis, Hess., Archiv. f. Naturg., p. 170, pi. vii., fig. 22 

 (1865), wdiicli Miers puts down as a doubtful synoin'm of 

 Squilla neiKi, Latreille. 



I have no doubt that the •' Lysiosquilla tricarinata {Coro)iis 

 tricarinata, Gray, ined. White List, Cr. Brit. Mus., p. 85, 

 1847)" mentioned by Miers'-' is identical with the species now 

 under consideration. Miers compared it with Kirk's descrip- 

 tion of Squilla indefensa, and says it is " very probable that it 

 belongs to the same species;" and, from the further description 

 of the unique specimen that he gives, I have no doubt this 

 identification is correct. The specimen was collected in the 

 Antarctic expedition under Captain Sir J. C. Eoss, but the 

 locality has not been preserved. I am not able to find out 

 whether White gave a description of it or not, and whether 

 his name, therefore, has precedence over Wood-Mason's or not. 



The species we are considering, though described by most 

 of its authors under Squilla, was placed by fliers under the 

 genus Lysiosquilla, Dana, the species of which differ from the 

 more typical species of Squilla chiefly in the absence of the 

 longitudinal ridges or keels on the cai'apace and abdomen. 

 As no description of this genus has as yet been given in 



* Loc. cit., p. 3 2. 



