
358 RECORDS OF THE S:A,. MUSEUM 
4, Female with sxopods on first and second pairs of peracopods only, First peraeopod with 
propodus not very large, at most barely more (usually much less) than half as long as basis 
Gynodiastylis Calman, 
Female with exopods on first to fourth pirppopnds. First peeeepes with propodus very 
large, at least little shorter than basis .. Dicoides gen. nov. 
5. First antenna with third segment of peduncle aistinetly longer than combined lengths of the 
dilated first and second segments. First peraeopod shorter than cephalothorax, its dactylus 
with no brush of very long setae. Pseudorostrum upturned in female and young male 
Allodiastylis Hale. 
First antenna normal, the third segment of peduncle much shorter than combined lengths 
of first two joints, which are not dilated. First peraeopod longer than cephalothorax, its 
dactylus. with a brush of pany long setae eae from distal half. Pseudorostrum not 
upturned ra : oe Zimmeriana gen. nov. 
Genus SHEARDIA nov. 
Female. The first antennae are much as in Allodiastylis (particularly A. 
tenuwipes sp. nov.), and have the two proximal segments greatly expanded; the 
third joint, however, although much elongated is shorter in relation to the rest 
of peduncle, The whole appendage is more than half as long as the carapace. 
While the prominently enlarged and projecting basal joints of the first 
antenna separate this from all other of the related genera except Allodiastylis, it 
is distinguished from the last-named by the absence of long distal setae on the 
pseudorostrum (which is not upturned) and by the presence of well-developed 
exopods on the first and second peraeopods. The telson is very different; as a 
whole it is small, with preanal portion very short, and post-anal part rather long 
for the group and armed with a pair of unusually stout spines. 
Genotype Sheardia antennata sp. nov. 
Like Gynodiastylis but differing in the character of first antenna and telson. 
In species of Gynodiastylis having the telson proportionately as short, there is no 
post-anal part, 
The genus is named after Mr. Keith Sheard, who is responsible for the 
securing of much of the material dealt with herein. 
SHEARDIA ANTENNATA sp. Nov. 
Ovigerous female. Integument calcified, and chalky-opalescent in appear- 
ance; with fine reticulate patterning, particularly distinct on pedigerous somites. 
Carapace less than one-third of total length of animal, considerably wider 
than deep and two-thirds as long again as deep; seen from above it is subtriangular 
in shape, broadest posteriorly and irregular laterally because of a dorso-lateral 
elongate tumidity on each side below frontal lobe and a distinct hollow below and 
to the rear of this elevation; the posterior two-thirds of the dorsum is depressed 
with the median portion and lateral edges of the hollow raised in the form of 
rounded folds; inside each rear corner of frontal lobe is a low boss. Antero-lateral 
margin almost straight, and antennal angle well defined, subacute and finely 
serrate, the tiny teeth continued along inferior margin. Pseudorostrum narrowly 
truncate in front, the lobes meeting for a distance equal to about one-fifth of 
length of carapace. Frontal lobe wide, distinctly defined; ocular lobe twice as 
broad as long, with three very ill-defined lenses. 
Pedigerous somites together three-fourths as long as carapace. First not 
much shorter than second, which is shorter than any of posterior three and has 
the pleural parts forwardly produced; third and fourth fused together, the third 
forwardly produced laterally (where it overlaps second) and bent backwards so 
that second and third peraeopods are well separated; there is a pair of low 
dorso-lateral ridges on fourth but no other defined sculpture save the fine median 
line so often present. 
