76 



Memoirs of the Indian Museum. 



[Vol. II, 



ramus reaching the base of the fourth joint from the tip of the anterior ramus ; 

 both rami are pointed and tapering, with the last few joints very small, the anterior 

 ramus having about i6 and the posterior ramus about 14 joints, but those at the base 

 being imperfectly differentiated in each case and variable in this respect. The 

 anterior ramus of the second cirrus is slightly longer than the posterior but each has 

 about 30 joints. The first cirrus is not very widely separated from the second. There 

 are four lateral appendages on each prosoma, two being very much longer than the 

 others (which are sometimes almost rudimentary), and two at the base of each first 

 cirrus, one of them on each side being very long and delicate. The penis is not so 

 long as the sixth cirrus; it is slender, tapering to a point, minutely annulated, densely 

 covered with soft hairs of irregular length, especially on the distal half ; there is a 

 pencil of rather longer hairs at the tip. Anal appendages smooth, short, distinctly 

 curved and claw-like. 



Mouth parts. — Lahrum moderately prominent. Maxilla with a deep excavation 

 near the upper margin, from which it is separated by several long stout spines, one 

 of which is particularly well developed. Below the excavation are three steps of 

 somewhat variable proportions, each bearing a double row of stout bristles. Mandible 

 with six teeth including the inner angle, which is pointed but rather stout and bears 

 a dense fringe of short bristles on both edges. 



Lepas anatifera, I^inné, subsp. indica, nov. 

 Capitulum compressed, subtriangular, the apex being somewhat truncate ; the 

 carinal margin arched, the occludent margin slightly sinuous. The valves thick, 

 opaque, white, covered with a delicate, deep purple membrane arranged in sinuous par- 

 allel bars corresponding with the lines of growth. This membrane is easily rubbed ofï 

 and soon loses its colour in spirit. When worn it often 

 persists as a line of square spots in a series of small 

 depressions running down the capitulum from near the 

 umbo of the tergum to that of the scutum in a curved 

 line and growing larger in the middle of the line than they 

 are at the ends. The valves are separated from one 

 another by lines of purple or purplish membrane, which 

 are sometimes rather broad towards the base of the 

 scutum. Tergum broadly truncate at the apex ; the 

 occludent margin straight, slanting outwards, produced 

 into a tooth at its junction with the scutal margin; 

 about one-fourth as long as the scutal margin ; radiating 

 ridges prominent, especially one running from the umbo 

 to the occludent angle. Scutum quadrilateral (the scutal 

 margin being distinct from the carinal margin), feebly 

 convex even at the base ; the surface almost smooth 

 except for a vertical ridge, which bears the same relation 

 to the occludent margin as the homologous ridge does in 



Fig. 4. — Lepas anatijera 

 sub-sp. indica, x 2i. 



