iqog.] 
N. AnnandaIvE : The Indian Cirripedia Pedunculata 
99 
II. Valves more or less rudimentary. Tergum much reduced. 
A. Tergum ' shaped like an axe with the shaft pointing 
towards the carina in a slanting direction. 
a. Carinal segment of scutum triangular. Carina 
divided transversely near the base . . . . D. warwickii. 
aK Carinal branch of scutum linear. Carina entire . . D. grayii. 
B. Tergum saddle-shaped, vertically elongate, or (occasion- 
ally) square. 
b. Carinal segment of scutum triangular ; occludent 
segment linear or almost so . . . . . . D geryonophila . 
b'. Scutum consi.sting of three linear branches, one 
horizontal and two vertical ; tergum subtriangular but 
vertical.. .. .. .. .. D. rhinoceros. 
b". Scutum consisting of two linear branches which 
meet one another at an angle less than a right angle ; 
the lower branch passing above and almost parallel to 
the basal branch of the carina . . . . D. sinuaia. 
C. Tergum star-shaped. 
c. Scutum consisting of two linear branches meeting 
one another at an angle, the lower branch shorter and 
narrower than the upper . . . . . . D. stella. 
D. Valves much reduced. Tergum absent or represented 
by an amorphous chitinous patch. 
d. Carina forked at its base ; the basal branches 
directed upwards in a slanting direction . . . . D. cor. 
d' . Carina sometimes absent, its base either simple or 
forked, the basal branched, when they are developed, 
horizontal . . . . . . . , D. angulata. 
The different species of Dichelaspis differ so much from one another as regards 
the shape of the valves that it is not surprising that attempts have been made to 
divide the genus. In 1869 Macdonald described D. neptuni as Paradalepas neptuni , 
in a paper entitled “On an apparently new genus of minute parasitic Cirripedes ” 
{P.Z.S., 1869, p. 440), while in 1894 Stebbing introduced a new genus for the form 
he called Trichelaspis forresti {Ann. Mag. Nat. Hist., xiii, p. 443). The latter was 
believed to be distinguished from all other species of Dichelaspis by the fact that it had 
three branches to the scutum. Gruvel, however, has since pointed out that this 
character is not constant even in individuals of Stebbing’ s species ; it is even more 
marked in one of my new species, D. rhinoceros , so called from the resemblance in out- 
line between its scutum and the top of the head and the horns of a two-horned rhino- 
ceros. There does not seem to be any justification for the separation either of these 
* In the var. pernuda of D. grayii the tergum is absent. This species may be recognized by the 
great length of the caudal appendages, which are from | to J as long as the sixth cirri. 
