356 AXEL A. OLSSON 



Subgenus GOBRAEUS Leach in Gray, 1852 

 Type species by monotypy, G. variabilis Leach {=Solen vespertina 

 Gmelin, 1791). 



Shell usually somewhat inequilateral, the posterior side is a little 

 longer and narrower, with widely rounded or obliquely truncated ends. Sur- 

 face smooth, plain or with a rayed pattern, lilac and purple tints predomi- 

 nating. Posterior end with an open gap. 



The species of this subgenus have been referred by most authors to 

 Psammocola Blainville, 1824. As shown recently by Palmer (1958, Mem. 

 76, Geol. Soc. America, pp. Ill, 112), the name "Psammocola," first intro- 

 duced by Blainville in 1824 must be based on its original description with its 

 reference to a species illustrated in the Encyl. Methodique (pi. 231, figs. 3 

 a, b, c), and not on the figure given by Blainville the following year (1825, 

 Manuel de Malacologie, pi. 77, fig. 4). The figure in the Encylopedie repre- 

 sents a different species from that illustrated on Blainville's plate, which 

 was, therefore, subsequently added. Blainville's illustration seems to repre- 

 sent a species near or closely similar to the Caribbean Asaphis deflorata. 



Gari (Gobraeus) maxima (Deshayes) Plate 63, figures 7-7b 



Psammobia maxima Desliayes, 1855, Proc. Zool. Soc. London for 1854, p. 3.7. Hab. ? 



— Reeve, 1857, Conch. Icon., vol. 10, Psammobia, pi. 1, fig. 4. Hab. Panama. 

 Gari {Psammocola) maxima (Deshayes), Hertlein and Strong, 1950, Zoologica, vol. 



35, pt. 4, p. 218.— Keen, 1958, Sea Shells of Tropical America, p. 190, fig. 464. 



Shell high, ovate-rectangular, inequilateral, the posterior side longer, 

 slightly convex or depressed, the anterior side obliquely rounded, the pos- 

 terior more or less truncated. The surface in life or in fresh specimens 

 covered by a straw-brown to nearly black periostracum, the shell under- 

 neath pale lilac or purplish-brown with narrow white rays, best shown on 

 the posterior area. The pallial sinus is large, rounded at the end, and ex- 

 tends to a vertical under the beak. The shell internally is white or faintly 

 flushed with purple. 



Length 52 mm., height 31.3 mm., diameter 15.8 mm. 



Range — Gulf of California to Ecuador. Colombia: Gorgona Island 

 (Hertlein and Strong). Panama: Pearl Islands. Ecuador: Manta; Santa 

 Elena; San Lorenzo. 



Gari (Gobraeus) lata (Deshayes) Plate 63, figure 9 



Psammobia lata Deshayes, 1855, Proc. Zool. Soc. for 1854, p. 318. Hab. Central America. 

 — Reeve, 1857, Conch. Icon., vol. 7, Psammobia, pi. 1, fig. 7. — Hertlein and 

 Strong, 1950, Zoologica, vol. 35, pt. 4, p. 218, (foot-note). 

 Gari {Psammocola) lata (Deshayes), Keen, 1958, Sea Shells of Tropical West America, 

 p. 190, fig. 464. 

 Short, obliquely rectangular, with the dorsal and ventral sides straight 

 and parallel, the anterior end, obliquely rounded. Surface plain and covered 

 with a dark, scaly periostracum. Length about 60 mm., height 40 mm. 

 Apparently rare and not recorded since its first discovery. 

 Range — Central America. 



Gari (Gobraeus) sp. Plate 63, figure 10 



Psammobia {?Amphichaena) regularis Carpenter, 1864, Ann. and Mag. Nat. History, 

 No. 3, vol. 13, p. 312 Cape San Lucas. 



