144 "TERRA NOVA" EXPEDITION. 



p. 230) as Squilla tridentata. Thomsou's . type-specimen was only three-quarters of an 

 inch in length, and Chilton (1891, p. 61), who re-examined it, regarded it as a young 

 specimen of Lysiosqiiilla sjyinosa (Wood-Mason). Kemp (1913, p. 119), while 

 accepting the identification, remarks that " it is not very easy to account for the small 

 number of dactylar teeth, for the specimens which Lanchester records from Penang, 

 and which also were only '75 inches in length, possess twelve to fourteen teeth. It is, 

 however, not impossible that the post-larval development of the species may vary in 

 different localities." While this possibility may be admitted, it must be pointed out 

 that the present form appears to be distinguished by other characters besides the 

 number of dactylar teeth (especially by having the rostral plate as long as it is broad) 

 from the allied form with seven dactylar teeth found in the same locality and described 

 below ; further, its specific independence is supported by the fact that, out of a 

 considerable number of larvae of the " Lysierichthus " type found in company with it, 

 the largest specimen (about 10 mm. in length, including the rostrum) shows rudiments 

 of three teeth (making, with the terminal one, four teeth in all) on the raptorial 

 dactylus. The younger larvae may, or may not, belong to the same species ; I cannot 

 find any conspicuous characters in which they differ among themselves. 



9. Lysiosquilla, sp. 



Occurrence. — Stations 133 and 135. Spirits Bay, New Zealand. Plankton at 

 3 and 20 metres depth. Two specimens (post-larval). 



Remarks. — The specimens are of the same size (about 11 mm. in length) as the 

 post-larval specimen from Station 135 described above, and resemble it in general 

 characters. They differ, however, in having seven teeth (including the terminal one) 

 on the dactylus of the raptorial limbs, and in the much shorter rostral plate, the length- 

 of which is about two-thirds of its breadth at the base. As the number of dactylar 

 teeth in the adult L. sjiinosa is stated to range from nine to fourteen, it is just possible 

 that these specimens may belong to that species. The only other species of the genus 

 recoi'ded from New Zealand is L. brazieri, Miers, which Kemp identifies with 

 L. latifrons, de Haan. In that species there are six, or, rarely, seven dactylar teeth, 

 but the short ramus of the last thoracic appendage is almost linear, while in the 

 specimens now examined it is only slightly narrower than that of the preceding limb. 



10. Coronida hradyl (A. Milne-Edwards) \_Coroniderichthus armatus {l^Qa.ah)']. 



Coronidericlitlms armatiis (Leach), Hansen, 1895, p. 81, pi. viii, figs. 3-3d (with synonymy). 



Occurrence. — Stations 46, 47, and 49. South Atlantic, off Brazilian coast. 

 Surface-plankton. Four specimens. 



Remarks. — The specimens agree closely with Hansen's account of this large and 

 well-known larval form, the abundance of which in the warmer parts of the Atlantic 

 is in striking contrast to the extreme rarity of the adult species to which Hansen refers 



