of Recent Brachiopoda. 371 



VI. Genus Morrisia, Dav. 1852. 



Shell minute, circular, depressed ; foramen large, round, en- 

 croaching equally on both valves; larger valve with a small 

 straight hinge area ; deltidium plates minute, widely separated; 

 smaller valve deeply notched at the umbo ; apophysary system 

 consisting of two branches, originating at the base of the dental 

 sockets, and united to a small elevated process arising from the 

 centre of the valve. 



Animal furnished with two subspiral or sigmoid arms, fringed 

 with comparatively large cilia : these arms originate above the 

 mouth (as shown in the figure) supported by the crural processes, 

 and after passing forwards and converging in front of the mouth 

 they again turn outwards, each having the shape of the letter S. 



The shell is of a dark green colour, with bright orange ovaries, 

 contrasting with the brilliant white of the ciliated arms. The 

 cilia (more properly cirri) are grouped in pairs, as we believe to 

 be the case in the Terehratulce generally. 



40. Morrisia seminulum, Philippi sp., Enum. Moll. Sicilise, 1836, 

 pi. 6. fig. 15. 



Ter.depressajYovh^^, Rep. of the Mol. of the jEgean Sea, 1843. 



Hab. Mediterranean, depth 95 fathoms (Forbes). 



Obs. Philippics species has been mistaken by Sowerby, who 

 gave the name seminulum to another form which we have called 

 Argiope Forbesii. The original figures of seminulum are circular, 

 and clearly exhibit the deep notch in the umbo of the smaller 

 valve characteristic of the genus, and not to be found in any 

 species of Argiope : according to Kiister the shell under notice 

 has received the name of Ter. Neapolitana from Scacchi, Oss. 

 Zool. ii. p. 18 ; but not having been able to find the paper alluded 

 to, I have retained Philippics name. 



VII. Genus Magas, Sow. 1818. 



The genus Magas is characterized by the peculiar shape of its 

 apophysary system, composed of an elevated longitudinal sep- 

 tum in the imperforated valve, to which are affixed two pairs of 



