A. E. Verriti—Marine Fauna of North America. 53 
complicated. Having had occasion to revise this family, I 
offer the following summary of the New England species. 
I. especie Pallas, 1766, (restricted), Zocecia unilateral, in two 
Iternating rows, mostly protected by lateral spines, either 
aeiple or dilated. Seo and lateral and median avic- 
ularia present. Type serupos 
a. Subgenus Cellularia. (ce devapocalian’ ia, pars, Gray, Busk). 
e, 
6. Sub-genus Cellarina Van Ben. (incl. a Flem., 1828.) 
One of the lateral spines usually m or ap s dila ted, and 
often expanded in a shield-like ees in ay of the zoccia, 
wo New England species: C. scabra Van Ben.; and @. 
ternata (Sol.) with varieties gracilis and duplex (Smitt). 
The name Tricellaria (given to ternata), might have been 
cage for gate pees, but is very inapplicable to the 
oup, and e o the Ea tes as now known. 
Il, Reason Oken (ere), (= Serupoce ctrin pars, Gray; 
Canda Busk, non Lam Lateral avicularia and vibracula 
absent. A lateral Byitis "develo ops into a proteative (often 
frondose) shield. Type S. reptans (Linné), not yet found on 
the erican coast. 
IL Bugutopss Verrill (ast Cellularia, pars, Busk, non Pallas). 
Characterized by the — unarmed % eevee et in 
As no species of the last group was originally qcicabt in Cellu- 
laria, it is inadmissible to restrict oe t name to it. erefore 
sense, for the original group thus na ers mouroux is a 
valid and very distinct genus. Canda nat 1816), adopted 
by some for Cellularia reptans, cannot properly be so used, for 
the original type is a distinct genus. 
Porellina stellata, sp. nov. — 
A large, handsome species, forming radiating patches on 
shells, ete. — arranged in quincunx, large, broad, mod- 
n recorded from the Gulf of St. Lawrence by Packard 
* This species has 
and others, but I have sys seen no American examples. , 
name has rr ace eis anita co wok exit 
in accordance well as confusing, 
