REPORT ON THE AMPHIPODA. 1257 



Caprella scaura, Templeton, 1836 (PI. CXLIV.). 



1836. Caprella scaura, Templeton, Trans. Entom. Soe. Lond., vol. i. pt. iii. p. 191, pi. xx. fig. 6. 



1836. „ nodosa, Templeton, Trans. Entom. Soc. Lond., vol. i. pt. iii. p. 192, pi. xxi. fig. 7. 



1840. „ scaura, Milne-Edwards, Hist. Nat. des Crust, t. iii. p. 107. 



1S40. 1 ,, nodosa, Milne-Edwards, Hist. Nat. des Crust., t. iii. p. 108. 



1852. „ attenuate, Dana, U.S. Explor. Exped., voL xiii. pt. ii. p. 817, pi. lv. fig. 1, a-g. 



1855-6. „ gracilis (?), Stimpson, New Marine Invert, from the Chinese and Japanese Seas. 



1857. „ califomica (?), Stimpson, Proc. Calif. Acad. Nat. Sci., vol. i. p. 95 (89). 



1857. ,, califomica (?), Stimpson, Journal Boston Soc. Nat. Hist., vol. vi. p. 73. 



1862. „ scaura, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 355, pi. lvi. fig. 4. 



1862. „ nodosa, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 357, pi. lvi. fig. 7. 



1862. „ attenuata, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 364, pi. lvii. fig. 7. 



1862. „ gracilis, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 365. 



1872. „ califomica, Boeck, Bidrag til Californiens Amphipodefauna, p. 35. 



1874. ,, scaura, Hoffmann, Recherches sur la Faune de Madagascar et de ses dependances. 



1874. „ nodosa, Hoffmann, Recherches sur la Faune de Madagascar et de ses dependances. 



1882. „ scaura, Mayer, Die Caprelliden, p. 65. 



1882. „ attenuata, Mayer, Die Caprelliden, p. 67, figs. 24, 25. 



1882. ,, califomica, Mayer, Die Caprelliden, p. 68. 



1882. „ gracilis, Mayer, Die Caprelliden, p. 70. 



1884. „ attenuata (?), Miers, Report on Zool. Coll. H.M.S. "Alert," p. 320. 



In regard to the above-given synonymy I accept Mayer's conclusion that the minute 

 Caprella nodosa of Templeton is no doubt the young of Caprella scaura ; whether it is 

 the female form is perhaps not easy to determine in regard to so small a specimen as that 

 which Templeton describes. Mayer is strongly inclined to make Dana's Caprella attenuata 

 a synonym of Caprella scaura. Dana's species was found at Rio de Janeiro, and Mayer 

 has received specimens both from Rio and from Australia (Port Jackson). Templeton's 

 species was found at Mauritius ; the Challenger specimens came from the neighbourhood 

 of Japan, and agree so closely with the figures and descriptions given by Templeton and 

 Dana for the male and by Mayer for both sexes, that there can be no further doubt about 

 the identity of Caprella attenuata with Caprella scaura, the species evidently having a 

 very wide distribution. As Mayer's figures of the two sexes have already shown, there 

 is in this species the curious peculiarity that the female is spiny or tuberculated, while 

 the male except for the cephabc tooth or horn is very nearly smooth. In the species 

 which Boeck calls "Caprella califomica, Stimpson," taken in the neighbourhood of San 

 Francisco, there is the same peculiarity, and allowing for a certain amount of variation, 

 such as is almost certain to occur where one sex is smooth and the other spiny, Boeck's 

 description seems to justify the addition of Caprella califomica to the synonymy of 

 Caprella scaura. It is to the following effect: — 



" The animal's length is in the $ from head to pleon 1 6 mm , in the $ 1 3-1 4 mm . The body 

 is as in C. linearis Lin. (C. lobata Mull.) very different in $ and ? . In the former it is 



1 Kr0yer, Katurh. Tidsskr., R. 1, Bd. iv. p. 504, 1843, refers to Caprella scaura and Caprella nodosa in a footnote. 

 (ZOOL. CHALL. EXP. — PART LXVIL — 1888.) Xxx 158 



