37 



one, lying between the 4th pah- of legs, and fitting by means of a short stem 

 between a pair of smaller lateral ones lying between the 5th pair of legs.. 



This species attains a length of 4^ inches. 



There are 59 specimens in the Museum collection, registered as follows : — 



-- — -T — Malabar coast. F. Day. 



^^Z^ Nolnstorj. 



381-90 392^. 441^5 461-70 ^^^^ g^^,^.^ . Investigator." 



10 ■ 10 10 ■ 10 



?^ Karachi. British Museum. 



10 



la. Paeapeneopsis stylifera var. cokomandelica Plate VII., fig. 2t), 20u-c. 



In this variety the marginal spines of the telson are reduced to a large pair, 

 and occasionally a second minute pair, at the base of the terminal spine, this 

 C(jndition being constant in both sexes and at different ages. 



The collection includes 72 specimens of this variety, registered as follows : — 



Sandlieads, R. Hooghly. J. Rust and A. J. Milner. 



Orissa and Vizagapatam. "Investigator." 



Colombo. J. Anderson. 



Madras. Purchased. 



y 



2. Pene'opsis sculptilis. Heller. Plate VII., fig. 22, 22a-d. 



Pensus sciilptilis, ReWei-yYerh. zoo].-hot. Ges. Wien, XII. 1862, p. .S28, and Novara Cruet, p. 122, pi. xi. 

 fig. 1, 1865: lliers, Ann. JIag. Nat. Hist. (5) V. 1880, p. 457: deJIan, Journ. Liun. .Soc, Zool., XXII. 1888, 

 p. 286: Henderson, Trans. Linn. Soc. (2) V. 1893, p. 4-48: Nobili, Boll. llus. Torino, XVI. 1901, No. 397, p. 2, 

 and XVIII. 1903, No. 452, p. 5 IParapenieopsis). 



This species differs from P. stylifera in the following particulars : — 



The rostrum, though of the same shape, is often shorter, in some cases 

 (not, as far as can be seen, the result of breakage) not reaching the tip of the 

 antennular peduncle; often, in the adult male, the styliform part is lost, and 

 the rostrum then reaches only to the middle of the peduncle. The post-rostral 

 carina is distinctly canaliculate. The buttress of the post-antennular spine is 

 not so strong, and does not reach the hepatic fossa. 



The sinuous sub-hepatic ridge, defining the anterior part of the cervical 

 groove, is not continued to the tip of the branchiostegal tooth : this is quite 

 diagnostic in comparison with P. stylifera. 



