48 Memoirs of the Indian Museum. [Voi<. IV, 



var. dent at a ; another is on one side typical and on the other of the dent at a form. The 

 differences do not, in my opinion, deserve the distinction of a varietal name. 



In spirit specimens light chestnut brown colouration defines all the carinae of the 

 carapace and the submedian and intermediate carinae of the abdomen. There are also 

 in some specimens rather conspicuous brown markings on each of the abdominal somites 

 between the intermediate and lateral carinae. On either side of the median carina of 

 the telson there is a large and conspicuous, oval, chestnut brown spot : the two are 

 confluent posteriorly beneath the base of the distal spine. 



There are five specimens in the Indian Museum, registered as follows : — 

 N. W. of j i3°i7' I 5" N., 93°io'25" E. 185 fms. 

 [ i4°i3' N., 93°40' E. 370— 419 fms. 



2613-6 ( Andamans. 



' Investigator.' 2d 1 , 2 9 , 68 — 131 mm. 



^ S. of Port Blair, Andamans. 188— 220 fms., 'Investigator.' 19,89 mm. 



n°3i'4o" N., 92°46'4o" E. 



5. leptosquilla has also been recorded from the Celebes sea near the Philippine Is. , 

 115 fathoms (Brooks), and from the vicinity of the Nicobars, 296 metres (Jurich). 



15 Squilla tenuispinis, Wood-Mason. 



Plate III, figs. 32 — 34. 



1891. Squilla tenuispinis, Wood-Mason, Ann. Mag. Nat. Hist. (6), VII, p. 271. 

 1894. Squilla tenuispinis, Alcock, Ann. Mag. Nat. Hist. (6), XIII, p. 409. 



This species is very closely allied to 5. leptosquilla, but may be distinguished from 

 it by the following characters : — 



i. The dorsal surfaces of the carapace and abdomen are smooth, polished and 

 without trace of rugosity. 



2. The median carina of the carapace is obsolete and is entirely absent in front 



of the small dorsal pit (fig. 32). 



3. The intermediate carinae of the carapace are completely absent and the laterals 



are only visible in the extreme posterior part of the carapace (fig. 32 '). 



4. The rostrum only reaches to three-quarters the length of the antennular somite. 



It is broader than long, bluntly rounded anteriorly, and shows only the faintest 

 indications of a median carina. 



5. The eyestalks are rather more swollen. 



6. The lateral process of the fifth thoracic somite trends obliquely forwards. 



7. The telson is rather broader and the mid-dorsal carina is much less elevated 



(figs. 33, 34). 



Several male specimens of comparatively large size were examined, but the margins 

 of the telson are not nearly as strongly swollen as in large 5. leptosquilla of the same 



1 The figure is erroneous in showing intermediate carinae on the carapace. Anterior to the cervical 

 groove the regions external to the gastric grooves are evenly rounded; only at the extreme posterior end 

 of the indicated carina is there the faintest trace of a keel. The median carina, also, does not extend 

 as far forwards as is shown. 



