1909.] N. Annandai^e : The Indian Cirripedia Pedunculata. 91 



maximum length of scutum to maximum breadth about as 5 to 3. Carina 

 of almost the same width throughout when viewed laterally. 

 Habitat. — Japan and S. Pacific. 



Race II {P. diihium, Hoek).— A single vertical ridge on the scutum. Occludent 

 margin of scutum regularly curved but separated from the vertical ridge by 

 a more or less considerable interval ; maximum length of the scutum to maxi- 

 mum breadth about as 2 to i . Carina tapering from below upwards when 

 viewed from the side. 

 Habitat. — Seas of India (Gulf of Manaar) and the Malay Archipelago. 



Race III (P. aurantia, Darwin). — A single vertical ridge on the scutum. Occlu- 

 dent margin of the scutum protuberant and irregularly curved ; the greatest 

 length of the scutum to the greatest breadth about as 12 to 7. Carina broad- 

 est at the base when viewed from the side. Concentric striae on the valves 

 less marked than in the other forms ; valves more or less yellowish. 

 Habitat.— U. Atlantic, off W. Coast of Africa. 



Race IV (P. kcempferi litum, Pilsbry). — Very close to the last, from which it is 

 distinguished mainly by the greater protuberance of the occludent margin of 

 the scutum. Perhaps it should not be considered distinct. 

 Habitat. — W. Atlantic, off the coast of Florida. 



Race V (P. kœmpferi novœanglicB, Pilsbry). — Curve of the occludent margin of 

 the scutum regular, but separated by a considerable distance from the vertical 

 ridge, which is very distinct. There is a second vertical ridge on the valve, 

 less distinct than the first and approaching it at an angle. Carina very 

 slightly wider at the base than above when viewed from the side , 

 Habitat. — W. Atlantic, off the coast of New Jersey. 



In drawing up this table I have been obliged to depend very largely on the 

 figures published by Darwin, Gruvel, Hoek and Pilsbry, but, apart from the speci- 

 mens from the Gulf of Manaar, I have examined a small individual of the New 

 England race which I found on the carapace of a crab (Geryon quinquedens) from off 

 Martha's Vineyard, New Jersey, and a number of specimens of the race aurantia which 

 have been sent me by Prof. Bouvier and were originally attached to the type speci- 

 mens of Geryon affinis. Even before consulting Pilsbry's paper I had no difficulty 

 in identifying the New Jersey specimen as representing a form of P. kœmpferi. There 

 can be no object, I think, in separating the Indian from the Malayan race, at any 

 rate until more examples of the form have been examined ; in drawing up the defini- 

 tion of Race II I have made use of my examination of the specimens from the Gulf 

 of Manaar as well as Hoek' s description and figures. The length of the stalk is so 

 variable a character in other species of the genus that I have not alluded to it. In 

 P. minutum I find that while the stalk is usually short, about one individual in fifty 

 has it of several times the normal length. One of the specimens of P. kœmpferi from 

 the Gulf of Manaar is figured in the last part of the " Investigator " Illustrations 

 {tab. cit. supra). 



