1913O S. Kemp : Crustacea Stomatopoda of the Indo-Pacific Region. 45 



var. immaculata, Wood-Mason, MS. 



Plate II, fig. 31. 



This form differs from typical 5. scorpio in the entire absence of the black spot 

 on the lateral processes of the fifth thoracic somite (fig. 31), and with this colour dis- 

 tinction the following minor structural differences are correlated : — 



1. The rostrum is not longer than wide and its apex is rather broader than in 



typical specimens. 



2. The median carina of the carapace is sharp and distinct for a longer distance 



in front of the mid-dorsal pit, but terminates more or less abruptly before 

 reaching the anterior margin. 



3. The lateral carinae of the carapace are usually distinct throughout their course. 



4. The lateral margins of the sixth and seventh thoracic somites are slightly more 



upturned than in typical specimens and the process on the anterior part of 



the eighth somite is a trifle more acute. 

 The secondary sexual differences are as well marked as in the typical form. 

 The specimens in the Indian Museum are registered as follows : — 



3 -|5 E. of Terribles, Arakan Coast; 



13 fms. 



' Investigator.' 



1 <S , 48 mm. 



if? 'Bay of Bengal.' 





V. Ball. 



1 â , 50 mm. 



3 -f- 3 'Calcutta.' 





J . Wood-Mason and V. Ball. 



8cf ,7 2 , 41—95 mm. 



^ Pratapnagar, Calcutta. 





B. L. Chaudhuri. 



i c? , 87 mm. 



^jj* Ghaga Nata, Mutlah R. neai 



■ Calcutta 







(brackish water). 





S. B. Nath. 



14c?, 8 ? , 69— 86mm. 



2g* Saugor I., M. of Hughli R. 





J. Munro. 



id 1 , 87 mm. 



^ Hugli Estuary. 





Mus. Collr. 



2d 1 , 1 ? , 51— 64mm. 



^■ l Port Canning, Ganges Delta. 





R. D'Cruz. 



1 ? , 87 mm. 



M 3 - Karachi. 





(no history.) 



id , 96 mm. 



^ (Locality unknown). 







8d , 8 ? , 40 — 64 mm. 



The variety has never been taken in company with typical examples. The speci- 

 men from Pratapnagar was found in brackish water and this was probably also the 

 case with those labelled ' Calcutta.' 



13. Squilla mantoidea, Bigelow. 



1893. Squilla mantoidea, Bigelow, John Hopkins Univ. Circ, no. 106, p. 101. 



1894. Squilla mantoidea, Bigelow ; Proc. U.S. Nat. Mus., XVII, p. 521, figs. 13, 14. 



Bigelow gives the following diagnosis of this species: — ■" Eyes triangular, but 

 with the corneal axis at right angles to the peduncular one ; dactylus of raptorial claw 

 with six teeth, outer margin not sinuate ; rostrum subquadrate, carinate ; carapace 

 with five carinae, the median one bifurcated, and with strong anterior lateral spines ; 

 lateral spine of the fifth thoracic segment short, straight, acute and flattened obliquely, 

 lateral processes of the next two segments strongly produced and acute ; submedian 

 carinae on thoracic and abdominal segments without spines, except the sixth abdo- 

 minal ; telson with a crest and a long ventral keel, twelve or more lines of pits on each 



