of the ^^ Genu x''^ Peneus. 525 



IV. Diagnoses of Nine new Forms. 



1. Peneus indicus, var. penicillatus, nov. 



Peneus penicillatus, AVood-Mason, MS. (name only). 



This variety is distinguished by the form of the external 

 maxillipeds of the male. In these appendages the carpus 

 and propodite are much shorter and coarser than they are in 

 indicus and merguiensis, but, on the other hand, the dactylus 

 is a long tapering joint from 1| to 2| times the length of the 

 propodite, and the pencil of hairs occupying the groove on 

 the inner side of the dactylus is of almost corresponding- 

 length. 



The rostral crest is not so high as that of indicus, var. 

 merguiensis, but is higher than that of typical indicus, and 

 this intermediate form of rostrum also characterizes females 

 taken in company Avith males of penicillatus, a fact which 

 prevents us, for the present, from regarding j)enicillatus as 

 merely an allomorphic male of P. indicus. 



This form grows to a length of 6 inches. Numerous 

 specimens have been taken off: the Orissa coast and at 

 Bombay, and a few from Karachi, the Gangetic Delta, and 

 Mergui (Marine Survey collection). 



2. Parapeneus longipes, sp. n. 



Resembles P. fissurus, Sp. Bate, from which it is distin- 

 guished by the following characters : — 



The rostrum in the female barely reaches the end of the 

 first joint of the antennnlar peduncle. There is no trace of 

 a branchiostegal spine at the antero-inf'erior angle of the 

 carapace. 



The inner (longer) antennular flagellum is about as long 

 as its peduncle in the female, and a little longer in the male. 



The external maxillipeds reach the tip of the antennal 

 scale and the last pair of thoracic legs reach a dactylus- 

 length beyond them. 



The andricum is formed on the same plan, but in the 

 single male obtained it ends in a pair of (median) ragged 

 petaloid lobes and a pair of (lateral) stiff, curved, horn-lilvc 

 filaments. 



The thclycum consists of^ a broad longitudinally grooved 

 plate occupying all the space between the fifth pair of legs, 

 articulating with a horseshoe-shaped or concave and semi- 

 circular plate lying between the fourth pair of legs. 



The female attains a length of 8| inches. 



