1891. | BAKER—ON NEW SPECIES OF MURICID&. 135 
be counted), stongly shouldered and crossed by strong, raised longi- 
tudinal ribs and spiral iines; spire rather short and occupying about 
half. the length of the entire shell; there are on each whorl eight or 
nine strong raised, longitudinal costz, which are crossed by six strongish, 
raised spiral lines arranged in pairs, two being at the shoulder, two at 
the periphery, and two at the base of the whorl; the intersection of 
these longitudinal and spiral lines cause the shell to be cancellated or 
pitted, the pits being squarish or quadrate ; between each pair of spiral 
lines is a finer spiral line of a thread-like character ; spire rather stumpy ; 
sutures well defined ; whorls above the shoulder, between the shoulder 
and the suture, deeply excavated by the crossing of the longitudinal 
and spiral lines; aperture ovate, white within ; canal short, moderately 
wide and closed ; columella smooth, white ; outer lip strongly arcuate 
and five-toothed within, the denticles forming nearly raised tubercles ; 
umbilicus defined but closed; color red or chestnut overlaid by a 
lighter epidermis ; aperture white within. 
Alt. 12, diam. 7 mill. Aperture (excluding canal) alt. 4, diam. 2, 
mill. Habitat unknown. 
This species belongs to the a/veata and Peasez group of Murices, 
but from the material at hand appears to be distinct from any thing 
hitherto published. The shell is shorter in the spire than a/veata 
Kiener, and the aperture is much larger in proportion than Peasez 
Tryon (foveolata Pease), It has some resemblance to the figures of 
Ocinebra interfossa Cpr., but does not at all correspond with specimens 
of that species. I think there is very little danger of its being con- 
founded with any other shell. 
The species of Ocinebriz are very numerous, and the material 
ordinarily at the disposition of the student very small, so that no 
satisfactory catalogue of the group has as yet been published ; and the 
species described in this paper as new, may eventually prove to be of 
the many unfigured species, which have been described with brief 
Latin diagnoses and have not been identified by subsequent authors. 
Many of these descriptions have been very brief, of scarcely three lines, 
and furthermore without dimensions of any kind. Such careless work 
does not deserve recognition, and the species so described should be 
consigned to oblivion. The task of the monographer has not been an 
easy one on this account. A perusal of Sowerby, Reeve and Tryon 
will convince the student of the truth of my statements. 
PurRPURA (THALESSA) PROBLEMATICA, sp. nov. PI. 11, Figs. 2, 3. 
Shell strong, solid, chocolate colored under a cinereous epidermis ; 
spire conical, occupying about half the length of the entire shell ; whorls 
