îgog.] N. AnnandaIvE : The Indian Cirripedia PedimciUata. 8i 



approaching a triangle in outline. As regards colour, the smaller specimens from 

 Sumatra, and all those from the Bay of Bengal that I have seen have been trans- 

 parent, tinged with a vinous shade, and sometimes — by no means always — showing 

 in certain lights feeble traces of darker vertical bars. The larger specimens from 

 Sumatra, having a capitulum of a little more than lo mm. in length, are of a deep 

 purple colour, without markings, the peduncle being stained with violet-blue and 

 the membrane being opaque owing to the accumulation of pigment in its internal 

 layer. I should have been prepared to retain C. hunteri as a subspecies, as I did in 

 the last number of the " Investigator ' ' Illustrations, had it not been for the examina- 

 tion of several specimens from Sumatra, kindly sent me by Dr. van Kampen, and 

 for the fact that the scutum is distinctly Y-shaped in a striped specimen from a ship 

 from Brazil presented to the Indian Museum some years ago by Prof. K. Cornalia. 

 This specimen is but little different as regards the terga and scuta from one from the 

 mouth of the river Hughli I have recorded elsewhere {Journ. Asiat. Soc. Bengal 

 (N. S.), vol. ii, p. 207, 1906) but is very much more distinctly striped. It is figured 

 in the " Investigator" Illustrations, pi. v, fig. 2. Dr. van Kampen's large specimens 

 are very dark and show no trace of stripes, but the whole series exhibits great 

 variation as regards the terga and carina, the latter being wholly absent or repre- 

 sented by minute rudiments in several instances. The peduncle is much longer 

 relatively in the small individuals than it is in the darker and larger ones. 



There seems to be considerable variation as regards the mouth parts of C. virga- 

 tum. The mandible (fig. 6) is liable to be distorted, as one of Hoek's specimens of the 



Fig. 6. — Mandible of C. virgafum var. hiiiitcn, x 46. 



var. chelonophilus showed, and, apart from this, varies as to the pectination of the six 

 teeth which, including the inner angle, are present in normal individuals. In one 

 specimen I dissected I found that on one side the row of small, triangular projections 

 that constitute the pectination was near the upper edge of each tooth, while on the 

 other it was near the lower ; in neither was it on the edge. The innermost tooth 

 (inner angle) is very short and narrow, and may be either straight or project at an 

 angle. The two teeth next it in my specimens are much shorter than the one next 

 them on the other side. Darwin describes the maxilla (fig. 7) as having five steps on 



