80 B. N. PEACH ON SOME NEW CRUSTACEANS FROM THE 
exterior margin by five or six strong conical spines, the broken bases of which 
are seen in figs. 4 and 4c, set in hollows to receive them. Two little reniform 
bosses are seen on each of the abdominal segments as well as the telson. The 
tip of the rostrum has not been observed, as it usually buries itself into lower 
strata than the plane in which the body lies. The test is very thin, and 
probably contained very little calcium carbonate, as it is apt to be filled with 
calculi, such as that now found in the common shrimp. Where the test is thin 
these are mere scales; but in the spines and thickened portions they are 
semi-globular, the rounded part being mammilated. In every case, however, 
they have a central nucleus from which radiations proceed. The above 
remarks are equally applicable to all the Crustacea described in the present 
paper. Sometimes these calculi are sporadic, at other times they fill the whole 
tests of the creatures, forming an irregular polygonal net-work, which destroys 
the character of the test and gives it a granulated appearance. Even in this 
case the nucleus and radiations are observable. Fig. 4g represents a portion of 
the carapace of fig. 4, magnified about four diameters exhibiting these calculi. 
Fig. 4h is part of the test of the common shrimp Grangon vulgaris, affected in a 
similar manner and magnified about ten diameters. I propose to call this species 
after my friend WALTER Park, Esq., Langholm, Dumfriesshire. Though A. 
Macconocuie was the first discoverer of the species, Mr Park was the finder of 
the specimen from which fig. 4d is taken, which he not only handed over to 
the Geological Survey, but generously offered to its collection anything new 
which might turn up to his hammer. Dr TRAQUAIR was fortunate enough to 
disinter the magnificent specimen represented by fig. 4. The illustrations are 
all natural size. Fig. 4d is an outline drawing of a portion of the carapace 
and the abdomen to show to what a size this species sometimes attained. A 
portion of the right side of a carapace, shown in fig. 4e, must have belonged to 
a still larger individual. 
Anthrapalemon Traquairti, nov. spec. (Pl. X. figs. 5 to 57). Carapace short 
compared to length of body, subovate, posterior margin concave, anterior mar- 
gin produced into a rostrum as long as the rest of the carapace. The only 
ornament is a broadened margin slightly crenulated. Cervical fold not dis- 
tinguishable from the other wrinkles of the test. Test smooth and exceedingly 
thin. Rostrum broad at the base and gradually tapering to a point, the upper 
line is slightly hollow and near the point is bent downwards. It is strengthened 
and deepened by a central keel beneath. A transverse section just in front of 
the eye would represent a capital T. Though there are several longitudinal 
grooves near its base, there appear to be no spines. 
Cephalic and Thoracic Appendages.—Eyes stalked and placed on each side 
of rostrum, which is hollowed out to form with the margin of the carapace a sort 
