162 



shell of 31agasella compta, but the beak and foramen of the 

 latter are very small. The excellent figures of the species, 

 drawn by Mr. 11. M. Johnston, which I have had reproduced, 

 show a large incomplete foramen, and may therefore indicate 

 a young Terebratula or allied form. If the shell be an adult, 

 then it probably belongs to Terebratella, where I have ventured 

 to place it. 



Locality and Horizon. — Miocene strata, Table Cape, Tasmania 

 (Johnston). 



GENUS MAGASELLA, Dall. 



The four following species are referred to Mag a sella, because 

 of the strong resemblance they bear to Terebratella (7) Guming- 

 iana, now transferred by Mr. Davidson to Dall's genus, whose 

 description has not yet reached me. They agree externally in 

 having a prominent beak with a small foramen and the 

 deltidium blended with the shell ; the loop presents the 

 characters of Terebratella, whilst in others it seems to be 

 related to that of Magas. 



Magasella compta, Sowerby. PI. x., figs. 6a— 6e. 



JRef. — Terebretella compta, Sow., in Strezlecki's Phy. Desc. of 

 N.S.W., &c, 1845, p. 297, t. 19, f . 4 (JVon Woods' Geol. Obs. 

 S. Aust., p. 74, 1862). 



Terebratella compta, Woods, Trans. Phil. Soc, Adelaide, 

 f. 4>a — b (? non 4c — e), 1865. (JSfon Etheridge, jun., Ann. and 

 Mag. Nat. Hist. t. 2, f. 5, p. 19, 1876.) 



" Shell smooth, thin trapeziform ; lateral margins sub- 

 incurved, anterior margin small obtuse. Hinge area large, with 

 a longitudinal depressed line at either side. Brachial valve 

 triangular, rounded slightly, truncated in front with a small 

 median sinus ; peduncular valve faintly keeled. Eoramen 

 terminal, small, and round." — Sowerby. To which description 

 Mr. Woods has added brachial valve sub-cordiform, flat, and 

 both valves marked with concentric lines of growth. 



The young is nearly circular in outline, with a marginal 

 median sinus in the brachial valve ; beak and foramen small, 

 with little or no deltidial area. 



The loop is only known by one example (fig. 6e) ; compared 

 with that of 31. Gumingiana, the following differences are 

 observable : — In M. Gumingiana the erect and thick projection 

 of the septum has, in reality, two distinct slender loops 

 attached to it. But in the example before us the loop at its 

 reflection is broadly expanded, and embraces the elevated part 

 of the septum ; it then extends into an almost complete circle. 

 It thus has considerable analogy with that of Magas (sensu 

 strictu). The different dispositions of the loop in M. 



