A Revision of the Genus Auliscus Ehrh., &c. By J. Rattray. 915 



Soc. Lond., 1857, p. 81, pi. i. fig, 47) is Actinocydus Ralfsii /3 

 sj)arsus Grreg. (Kalfs in Pritch. Inf., p. 835). 



E. tesselatus Koper (Quart. Journ. Mic. Sci., 1858, p. 19, pi. iii. 

 figs, la, h) is Roperia tesselata Grun. (see p. 917). 



E. ? Grevillei Ealfs (Pritch. Inf., p. 938). Ealfs only supplies the 

 following characters : Markings obscure, punctate, spines arranged in a 

 circlet between the processes and the centre, systephanioid. Primary 

 rays absent. Processes 3, clavate, aulacodiscoid. — Habitat : Monterey. 

 This nnfigured species probably belonged to Aulacodiscus. 



E. ovalis Norman (Trans Mic. Soc. Lond., 1861, p. 8, pi. ii. fig. 6) 

 is Actinocydus ovalis (Van Heurck, Syn. Diat. Belg., pi. cxxiv. fig. 11). 



E. ? peruvianus Kitton (Pritch. Inf., p. 938) is Pseudauliscus 

 peruvianus, (see p. 903). 



E. ohscurus Grrev. (Trans. Mic. Soc. Lond., 1862, p. 90, pi. is. 

 fig. 4), is Pseudauliscus Petiti (see p. 906). 



E. minutus Hantzsch (Raben. Beitr., Heft i., 1863, p. 21, pi. yi. 

 fig. 9) is an Actinocydus. 



E. harbadensis Grrev. (Trans. Mic. Soc. Lond., 1864, p. 88, pi. xii. 

 fig. 4) is Pseudaidiscus ralfsianus (see p. 904). 



E. scaler Grev. (Trans. Mic. Soc. Lond., 1864, p. 81, pi. x. fig, 1) 

 is a Cerataulus. 



E. excentricus O'Me. (Quart. Journ. Mic. Sci., 1867, p. 245, 

 pi. vii. fig. 2) is Coscinodiscus excentricus var. hyalina, not Goscino- 

 discus minor as stated in the second edition of Habirshaw's Cat. 

 Diat. § Eupodiscus. 



E. gregorianus Breb. (Journ. Quek. Mic. CI., 1870, p. 41) is 

 synonymous with E. suhtilis Greg. (Trans. Eoy. Soc. Edin., 1857, 

 p. 501, pi. xi. fig. 50 ; Eaben. Alg. Europ., No. 2001), and belongs to 

 Actinocydus. E? suhtilis Ehrb. (Mon. Ber. Ak., 1855, p. 302) is a 

 nomen nudum. Specimens so designated were procured from 

 Simbirsk. 



E. Roperii de Breb. (Journ. Quek. Mic. 01., 1870, p. 41 ; Eaben. 

 Alg. Europ., No. 2005) is identical with Coscinodiscus ovalis Eoper 

 (Trans. Mic. Soc. Lond , 1858, p. 21, pi. iii. fig. 4), with Actinocydus 

 ovalis Grun., and A. Roj^erii (Van Heurck, Syn. Diat. Belg,, pi. cxxv. 

 fig. 5). 



E. velatus Grev. (Moll. Cat., 1874). — The specimen in Mr. Julien 

 Deby's Typenplatte No. 380, 4-3-12, by Moiler, is E radiatus Yi. 

 Sm. (Syn. Brit. Diat., i. p. 24, pi. xxx. fig. 255), and is synonymous 

 with Biddulphia radiata W. Sm. — not Eoper or Brightw. — (ibid., ii. 

 p. 48, pi. Ixii. fig. 255), B. liemitropa L. W. Bail. (Boston Journ. 

 Nat. Hist., 1862, p. 344, pi. viii. figs. 71-73, Zygoceros hemitropus 

 Bail, (ibid.), Gerataulus Smithii Ealfs (Pritch. Inf, p. 847), and 

 Odontella Smithii Van Heurck (Syn. Diat. Belg., pi. cy. figs. 1, 2.)^ 

 but not with Auliscus radiatus Janisch (Abb. Schl. Ges. yater. Cult., 

 1861, p. 162, pi. i. fig. 6; Eaben. Beitr., 1863, p. 4, pi. iii. fig. 15) 

 as stated in 2nd edition of Habirshaw's Cat. Diat. § Aidiscus. 



E. interpunctatus Brightw. — This species is only mentioned by 

 Grunow (SB. naturw. Ges. Isis Dresden, 1878, p. 181) in his 



