93 



Abdominal appendages biramous, with long protopodites : in the 1st pair the 

 inner ramus is small, and in all behind the 1st pair the inner ramus has the 

 usual styliform appendix at the base of the inner edge — the male having an 

 additional appendix on the 2nd pair. The exopodite of the caudal swimmerets 

 is divided by a transverse suture. 



The branchial formula in 10 Indian and European species examined by me 

 is as follows : — 



Total l( + 7ep.)* 6 5 12 + 7ep. 



* In one Indian species epipodites are absent from all the legs. 



Owing to the numerous discrepancies in Spence Bate's treatment of the 



Pandalidae, it is almost impossible to undertake the very necessary revision of 



the Pandalus group without an actual examination of the " Challenger " 

 material. 



From my own observations of the Indian and six of the European species 

 I am inclined to group them into the following subgenera : — 



I. Subgenus Pandalus (Type P. annuUcornis Leach). External maxilli- 

 peds without an expodite. Scaphognathite having its posterior lobe acutely 

 produced. [Rostrum armed dorsally with movable spines only. Antennular 

 flagella of moderate length.] 



"With Pandalus, as Caiman suggests, Diclielopandalus Caullery (" Caudan " 

 Crust., in Ann. Univ. Lyon, 1896, p. 379) should perhaps be included. 



II. Subgenus Pandalopsis A. M. Edw., Sp. Bate (Type P. ampla, Bate). 

 As Pandalus, but with the antennular flagella very long, the external maxillipeds 

 stouter, and the laminar expansion of the inner border of the ischium of the 1st 

 pair of legs very large. 



III. Subgenus Plesionika, Bate (Type P. uniproducta, Bate). External 

 maxillipeds with an exopodite. Posterior lobe of scaphognathite broadly rounded 

 off. [Rostrum armed dorsally with fixed teeth and sometimes with movable 

 teeth also.] 



With Plesionika should also be included Nothocaris. 



