100 
of Giard and Bonnier is such as to make one extremely hesitant 
of establishing new species, and I will therefore content myself 
with recording provisionally the specimen in my possession as a 
variety of the type species, viz., Pleurocrypta galatheae, var. north- 
umbriensis. 
A summary of such characters as are generally used for 
diagnosis is appended. 
The female measures from the frontal margin of the cephalon 
to the extremities of the uropods 13 mm. Colour, yellowish white, 
unpigmented : form, perfectly symmetrical with pyriform outline, 
the fact that the pleura of the right side are bent slightly back- 
wards being the only evidence of the pressure exerted by the cara- 
pace of the host: thoracic somites uniformly decreasing in width 
from the third to the first. and from the third to the seventh ; 
lateral cuticular extensions of the thoracic somites (pleura) leaf-like, 
semi-transparent. longer than the somite itself and overlapping, 
the posterior portion of each pleuron overlapping the anterior 
portion of the one immediately following. The margins of the 
somites immediately proximal to the pleura marked by crescentic 
or reniform cuticular bosses which are continued as longitudinal 
ridges along the posterior margin of each segment; pleura 
developed on the first five segments of the pleon and slightly 
wider than the segments themselves, somewhat crescentic in 
shape and semi-transparent. Antennules, antennae and maxil- 
lipeds normal. pereiopods completely concealed beneath the pleura. 
Outer surface of first pair of incubatory plates (Fig. 1) sub- 
divided into an anterior and a posterior portion by a deep 
groove or hollow fold: the anterior portion with its surface 
covered with small tubercles and its posterior margin (bordering 
the fold) somewhat crenate, the posterior portion, which in the 
natural position is concealed beneath the incubatory plates 
immediately following. with its surface smooth, and prolonged 
behind into a blunt tongue-like process. Inner surface of the 
first pair of incubatory plates similarly subdivided by a prominent 
transverse crest (“ créte interne” of Bonnier), showing a short 
series of three or four shallow digitations at its proximal end, but 
not. as in Bonnier’s specimen. bordée de petits tubercules arrondis 
placcs sur plusieurs rangs: five pairs of fiattened pleopods on either 
side, triangular in shape with elongated apices (which, in the 













