22 MARINE POLYZOA. 



4. MENIPEA TRISERIATA. PL XXIII. figs. 2, 3, 4. 



Cells oblong, rectangular (behind), bi-triserial, numerous. 

 Aperture oval, pointed below, and there partially filled in by a 

 granulated expansion ; one or two marginal spines on each side 

 above. Ovicell rounded, cucullate, smooth; lip of opening 

 entire. 



Hob. South Africa. 



5. MENIPEA MULTISERIATA. PL LX. 



Cells oblong, rectangular, slightly constricted at the waist 

 (behind) ; multiserial, numerous. Aperture oval, partially filled 

 in by a granulated expansion below ; a marginal spine on each 

 side above. Ovicell large, square, with a strong and long, 

 ascending, central umbo in front ; the front lip of the opening 

 emarginate ; a radical tube inserted into the lower part of each 

 marginal cell behind. 



Hob. ? B. M. (an var. prec.)? 



Although here placed under another name, there is perhaps 

 little doubt but that this form is merely a variety of the preceding. 

 The difference in the form of the lower part of the aperture, which 

 in M. triseriata is described as pointed, and which in the present 

 species usually appears square or rounded, seems to be owing 

 to the encroachment upon it of the large ovicell. The central 

 umbo in front of that organ, though at first sight a strongly cha- 

 racteristic diagnostic mark, may, as frequently happens, be owing 

 to local conditions. It is a very common thing, especially among 

 the LepralicB, that a boss-like projection of a similar kind should 

 be thrown out on the front of the cell or of the ovicell, and usually 

 upon both ; and it is not improbable that the umbo on the ovicell 

 in M . multiseriata may be of the same kind, a protective spine. 



6. MENIPEA PATAGONICA. PL XXIII. fig. 1 ; PL XXV. ; 



PL XXVI. figs. 1, 2. 



Cells elongated, slightly narrowed below, six in each inter- 

 node ; mouth oval, simple ; a very large and long spine on the 

 upper and outer angle, below which is a sessile avicularium ; a 

 single spine on the inner edge of the aperture. Anterior avicu- 

 larium single, small. 



Hob. Falkland Islands, Hooker-, Darwin. Port Desire, Patago- 

 nia, Darwin. 



In PL XXV. this species is inadvertently named Cellularia. It 

 is a species very variable in the size and form of the cells, and 

 several figures therefore of its various forms have been given. In 



