Barnacles of the Genus Scalpellum. 105 



interruption of the rows on the carinal side is never 

 extensive. Two dorsal filamentary appendages. 



As regards the filamentary appendages, which Amiandale 

 calls te ovigerous lamellae," and which he states are absent in 

 S. bengalense, their presence in the syntype above men- 

 tioned and in the ten other specimens dissected shows that 

 their absence must be considered exceptional. In the syn- 

 type (fig. 1, A) and in eight of the other specimens there are 

 three of these filaments depending from the tergal surface 

 of the prosoma, a short one being interposed between the 

 two longer and nearer to the posterior one. In one speci- 

 men the short process is reduced to a papilla, and in another 

 the posterior filament gives off two short branches near its 

 base. In two specimens the two long filaments alone are 

 present as in S. squamuliferum. Some half-dozen specimens 

 of the latter species were examined as to this point, and all 

 agreed with Annandale's description and figures. 



In none of our specimens of either species is the peduncle 

 much longer than the capitulum. 



The males, of which only three specimens (two on one 

 hermaphrodite) were found, agree very well in general form 

 with Annandale's figure of 1910, less well with that of 1916 

 or with Stewart's figure of 1911. With regard to the valves 

 of the capitulum, Annandale's description runs, "Capitulum 

 entirely without calcified valves, or with a pair of amorphous 

 scuta, or occasionally with minute terga in addition to such 

 scuta" (Annandale, 1910, p. 154). Two of our specimens 

 were removed for examination and found to disagree with 

 this account. They show no signs of terga, but possess a 

 pair of scuta (fig. 1,C) which by no means deserve the 

 epithet "amorphous/' and, in addition, a large and symme- 

 trically-developed carina (fig. 1, B). The whole surface of 

 capitulum and peduncle is covered with setse arranged in 

 regular transverse rows. Over the greater part of the surface 

 these setae are uniformly short, but towards the carinal side 

 of the capitulum they become lengthened, forming a thick 

 brush running along each margin of the carina but not 

 covering the carina itself. This brush is roughly indicated 

 in Annandale's figure of 1910. 



The males were attached close to the margin of the scutum, 

 external to the adductor muscle and just below a fold of cuticle 

 which forms the lower lip of the mantle-opening. The 

 slender peduncle is curved upwards and backwards over this 

 lip, so that the body of the male projects into the mantle- 



