48 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



fig. 142), from Florida and perhaps also the Pacific. Prof. Smitt evi- 

 dently merely placed the species under Hippothoa provisionally. It 

 comes near to the present species, differing from it in the apparently 

 orbicular outline of the secondary orifice, and in the position of the 

 lateral avicularia (of which only one may be present) at the lower 

 end of the peristomial prolongation, and in the smoothness of the 

 peristome. Itshould therefore stand as Gigantoporafenestrata, Smitt. 

 The present new species is a beautiful and striking form ; the hya- 

 line character of the shell, the curiously dumbbell-like outline of the 

 large front pore (which is apparently its normal form, though it 

 shows great variations from this, being almost orbicular in some 

 cases) with its distinct rim, the bilabiate aperture of the secondary 

 orifice, and the slender upwardly-projecting vibracula, all give it a 

 remarkable appearance. 



The question of affinity is a difficult one. The pore differs from 

 that of Anarthropora ; and Smittia, which has a similar peristomial 

 lip, wants the special pore ; while Microporella, on the other hand, has 

 the pore, but wants the lip. Probably the pore is a character of much 

 deeper importance than the lip, derived, as Smitt has shown it, by 

 the example of Porellina {Le]iralia) ciliata, to be, from the infra- 

 oral sinus. Therefore perhaps it is best to refer it to the Micropo- 

 rellidcB rather than to the EscharidcB, with which, however, it would 

 seem to have some points of affinity. 



PORINA GALEATA, Busk. 



Lepralia galeata, Busk, Cat. Polyz. Mus. Brit. ii. p. 66, pi. xciv. 

 figs. 1, 2. 



Hah. Elizabeth Island, Straits of Magellan, 6 fathoms, on thin 

 sea-weed; Sandy Point, 7-10 fathoms, on Pecfe«-valve. 



ScHizopoRELLA MARSTJPiUM, Macgillivray. (Plate VI. fig. 6.) 



Lepralia marsupium, Macgillivraj^, Tr. Phil. Inst. Victoria, pt. i. 

 vol. ix. p. 136. 



Zoarium incrusting ; cells adnate, radiating in more or less 

 straight lines from a centre. Zocecia distinct, convex, separated 

 by thin raised lines ; broad, with sharp inferior lateral angles, 

 rounded above, hyaline ; surface glistening, very minutely punctate, 

 and also bearing about 12 very shallow and indistinct pits of small 

 size, scattered. Orifice semilunar, rounded above, with sharp inferior 

 angles, lower lip straight, sinus shallow, rectangular ; from 2 to 3 

 blunt spines round orifice. Below orifice a very distinctly circum- 

 scribed semilunar area, entirely occupied by a large and very pro- 

 minent avicularian rostrum, convex immediately below mouth ; 

 opening large, circular, partially visible from above. Ovicell small, 

 subglobular, minutely punctate, hyaline and glistening, marked by 

 concentric lines. 



One specimen. 



Hab. Ehzabeth Island, 6 fathoms, on thin seaweed. 



