XIX. ISO 47 



Atherinichthys jacksoniana Giinther, Catalogue Fishes Brit. Mus. 3, 402, 1861. 



Chirostoma jacksoniana Waite, Mem. N. S. Wales Nat. Club, 2, 21, 1904. 



Type-locality. — Port Jackson, New South Wales. 

 Range. — Shores (or streams) of eastern Australia and Tasmania (Giinther). 



XIX. ISO Jordan and Starks, 1906. 



Tropidostethus Ogilby, Proc. Linn. Soc. N. S. Wales, 20, 322, 1895; Waite, Rec. 

 Austral. Mus., 5, 234, 1904 (preoccupied by Tropidostethus Phillippi, 1863). 



Haplotype. — Tropidostethus rhothophh.us Ogilby. 

 Iso Jordan and Starks, Proc. U. S. Nat. Mus., 24, 204, 1901. 



Haplotype. — Iso flos-maris Jordan and Starks. 

 Range. — Surf of Japan and Australia. 



This genus is the most specialized in the subfamily. It is an obvious 

 derivative of Atherina, however. From that genus it differs in the 

 following respects : the sharply compressed body, deep at the shoulder 

 and contracted to a fleshy keel along the edge of the belly ; the deep, 

 short head, truncated posteriorly ; the long anal fin, of 23 to 27 rays ; 

 the support of the juncture of the pubic bone with the ventral fin by 

 a strengthened rib ; the increased width of the lateral band, and especi- 

 ally the absence of scales on the head and the fore-part of the trunk 

 dorsally and ventrally^..-. 



7'A'I^^ ys.'iso rhothophilus (Ogilby). 1895.-^«- 



Tropidostethus rhothophilus Ogilby, Proc. Linn. Soc. N. S. Wales, 20, 322. 1895 ; 

 Waite, Rec. Austral. Mus., 5, 234, pi. 25, fig. 2, 1904. 

 Iso rhothophilus Waite, Mem. N. S. Wales Nat. Club, 2, 21, 1904. 

 Type-locality. — Maroubra Bay, between Port Jackson and Botany Heads, near 

 Sydney, Australia. 

 Range. — Surf of the eastern Australian shore. 



79. Iso flos-maris Jordan and Starks, 1901. •^*- 

 (Plate III, Fig. 10) 

 Iso FLOS-MARIS Jordan and Starks, Proc. U. S. Nat. Mus., 24, 205, fig. 4, 1901. 



Type-locality. — Enoshima, Misaki, Hada, Yoga and Hashigo, Japan. 

 Range. — Shores of southern Japan, in the surf. 



Upon comparison of typical material, we find that Iso flos-maris 

 is quite distinct from the Australian species. It differs in the more 

 slender body, the depth being contained 4.2 to 5.0 instead of 3.5 to 4.0 

 times in the length without caudal ; in the less anterior position of the 

 anus, which is a httle nearer the base of the caudal than the tip of the 

 snout, rather than the reverse ; in the consequently longer abdominal 

 region, with a higher percentage of the vertebrae abdominal (vertebrae 

 18 + 25 in Iso flos-maris, 15 + 28 or 29 in Iso rhothophilus); in 

 the smaller size of the scales, as indicated in the published figures of the 

 two species, and in the wider lateral band, which is separated by one- 

 half or two-thirds, instead of its entire, width, from the origin of the 

 anal fin (in two paratypes of I. flos-maris from Hashigo, however, the 



