MARINE POLYZOA. 79 



ascending process at the lower end ; wall composed of six to 

 eight contiguous ribs on each side ; mouth suborbicular, with a 

 projecting tubular process on each side, and two slender oral 

 spines above. Ovicell ? 



Lepralia melolontha, Landsborouyh's Pop. Brit. Zooph. p. 18. 



pi. .fig. 70. 

 Hab. Estuary of the Thames, Lieut. Thomas, on shell. East 



Coast ! Mrs. Gatty ; Busk. 



A very peculiar species, though in the costate structure of the 

 cell approaching L. nitida, and to which it seems, perhaps, too 

 closely allied. It grows in linear series, which branch out in an 

 arborescent manner, closely adhering to the surface of dead 

 shells. These branches, in process of growth, become more and 

 more crowded, and finally coalesce into a continuous expansion. 

 I first noticed this form in the year 1852, on some shells dredged 

 at the mouth of the Thames by Lieut. Thomas, R.N., and 

 afterwards found it on the coast of Suffolk, near the mouth of 

 the Orwell ; and about the same time it was found and its pecu- 

 liarities observed by Mrs. Gatty. 



31. LEPRALIA INNOMINATA. PI. LXXXVI. figs. 2, 3. 



Cells subglobose or ovate, rising in front into an umbo or 

 short keel ; furrowed, the grooves radiating from the central line ; 

 mouth suborbicular, with the lower lip straight ; four to six mar- 

 ginal spines ; a perforation a little below the mouth and above 

 the umbo. 



Lepralia innominata, Couch, Corn. Faun. iii. 114. pi. 22. fig. 4 ; 



Johnst. Hist. Brit. Zooph. ed. 2. p. 320. t. 55. fig. 12; Gray, 



List Brit. Rad. p. 121. 

 Lepralia pectiuata, Peach, MS. 

 Hab. Start Point, J. S. Bowerbank. Coast of Cornwall, Peach. 



Off Sana Island, G. C. Hyndman. On shell. 



32. LEPRALIA PUNCTATA. PI. XC. figs. 5, 6. PL XCII. 

 fig. 4. PI. XCVI. fig. 3. 



Cells subcylindrical, irregular, frequently wholly immersed, 

 foraminiferous, the punctures obscurely rowed transversely; 

 mouth oblong, transverse, occasionally very narrow, lower lip 

 projecting, mucronate ; four to six spines above, often wanting. 

 Ovicell pyramidal, obscurely keeled in front, and sometimes 

 crowned with a small avicularium at the apex ; occasionally a 

 small avicularium on one or both sides at the upper part of the 

 body close to the mouth. 



Lepralia arenacea, Bean, MS. 



BO 



