380 Records of the Indian Museum. [Vor arr 
that in the Indian form the rostrum is narrower and distinctly 
longer, reaching almost to the end of the eyes (cf. text-figs. 7a, b) 
and that the sixth abdominal somite is less distinctly grooved in- 
feriorly. There is the closest resemblance between the two groups 
of specimens in the form of the subchela and antennal scale. 
The characters yielded by the rostrum and last abdcminal 
somite may ultimately afford grounds for the recognition of the 
Indian form as a distinct subspecies, but in my opinion are insuffi- 
cient for specific distinction. 
A number of forms very closely allied to the common European 
species have been recorded from Japan; Miss Rathbun ', indeed, 
has reported the presence of C. cvangon itself at Rikuoku (Rikuchu) 
and Hokkaido. Balss*, the most recent author to discuss the 
Japanese forms, notes that Brashnikow ° (writing in Russian) has 
established the fact that C. crangon crangon does not occur in 

Fic. 7.—Crangon crangon (Linn.). 
Anterior portion of carapace, rostrum and eyes: (@) of an Indian SDSSESEE- 
(b) of a specimen from Plymouth. 
Japanese waters. He, however, givesa summary of the characters 
of C. affinis, de Haan, C. propinquus, Stimpson, C. hakodatez, 
Rathbun, C. consobrinns, de Man, and C. cassiope, de Man, and 
remarks that in the collections that he himself has examined these 
characters are inconstant, even in specimens from a single gather- 
ing. He regards the last four of the names just mentioned as 
synonyms of C. affinis, a form which he apparently considers to be 
merely a subspecies of C. crangon. 
If Balss is correct, the retention of a distinct subspecific 
name for the Japanese form seems to have little to recommend it. 
The characters of C. crangon, if tabulated on Balss’s plan, will 
evidently fall within the range of variation of the single Japanese 

|. Rathbun, Proc. U.S. Nat. Mus., XXVI, p. 42 (1902). 
2 Balss, Abhandl. math.-phys. Klasse K. Bayer. Akad. Wiss. Munchen, 
Suppl.-Bd. II, p. 62 (1914). 
Brashnikow, Mém. Acad. Imp. Sci. Nat. St. Pétersburg, (8), XX, p. 84 
(1907). 
