44 Memoirs of the Indian Museum. [Vol. IV, 



The telson has a well-marked median longitudinal carina which is usually ob- 

 scurely notched at the base ; it terminates in a small spine overhanging a blunt tu- 

 bercle. On either side of this carina the telson is smooth but, when examined with a lens, 

 is seen to be very finely rugose, and occasionally faint traces of symmetrically arranged 

 rows of pits are visible. On the margins, the submedian, intermediate and lateral 

 teeth are well developed, as is also the small praelateral denticle ; each forms the 

 termination of a short blunt carina. There are one or two submedian denticles, three 

 to six intermediate and one lateral. 



In the telson of the adult male the median carina, especially in its posterior half, 

 and the carinae which abut on the marginal spines, are considerably more swollen than 

 in the female, but the interspinous marginal areas are never dilated as they are in 

 S. gilesi and some other species. 



The bifurcate process from the base of the uropod is finely serrate internally. The 

 inner spine is much longer than the outer and bears a prominent external lobe a little 

 beyond its middle point. 



Spirit specimens invariably possess a large and very distinct black patch on each 

 lateral process of the fifth thoracic somite (fig. 30). There is also a black transverse 

 patch on the second abdominal somite and a suffusion of the same colour at the distal 

 end of the basal segment of the outer uropod. 



Freshly preserved examples are pale in colour with a thin sprinkling of black 

 chromatophores. The median and submedian carinae of the carapace, abdomen and 

 telson are bright red. The eyes are black with a yellowish stalk. Frequently there 

 is a row of four or five black spots on either side of the median crest of the telson ; 

 and the swollen bases of the marginal teeth are dusky. The colouring noticed in 

 spirit specimens is, of course, very distinct in fresh examples. 



Most of the specimens of Squilla scorpio in the Indian Museum are referred to the 

 var. immaculata. Only the following typical examples have been examined : — 



^ Madras. (Purchased). 1 d 1 , 1 ? , 60 and 76 mm. 



7032.5 v- 



7459-°6i ' Tuticorin, S. India ; 1 fm. J. Horaell. 5^,82, 41— 57 mm. 

 -ÏÔ- ) 



7 4p Bombay. Bombay Nat. Hist. Soc. 2 d , 86 and 93 mm. 



'^jr Karachi ? Karachi Museum. 1 9 , 97 mm. 



I have also examined one other specimen kindly lent me by Mr. J. C. Moulton — 

 Tambak, Borneo. Sarawak Museum. 1 ? , 90 mm. 1 



This species has been previously recorded from N. Australia (Miers) ; Celebes 

 (de Man) ; the Malay Peninsula (Manchester) ; Pondicherry (Latreille) and Madras 

 (Henderson) . 



1 In this specimen the right raptorial dactylus is malformed, doubtless owing to an injury. The 

 teeth are twisted and distorted and are six in number. 



