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CRUSTACEA OF THE MERGULI ARCHIPELAGO. 135 
little shorter than the propodites; they are laterally compressed, 
elongate-triangular, sharply pointed, and fringed with hairs on 
the lateral margins. The cephalothorax of the largest specimen 
is nearly 10 millim. broad. 
79. DovitLa INTERMEDIA, n. sp. (Pl. IX. figs. 4-6.) 
No fewer than thirty-two specimens, all males, were col- 
lected on the coast of Sullivan Island. This pretty small 
crustacean presents a much more striking resemblance to 
Forskal’s D. sulcata, from the Red Sea, than D. brevitarsis, for 
the cephalothorax is grooved almost in the same manner, and the 
legs also much resemble those of that species. Nevertheless, it 
may be distinguished at first sight by the merus-joints of the 
outer maxillipeds being not longitudinally suleate as in the 
typical Dotille, the internal half of these joints at least being 
quite smooth. Though these joints are still larger than the 
ischium-joints, they, however, present a remarkable transition 
towards the true Scopimere, in which the merus-joints of the 
external maxillipeds are as little sulcate as in D. intermedia. 
The cephalothorax nearly resembles that of D. sulcata, being a 
little broader than long; as regards the form of the front and 
the manner in which the upper surface of the carapace is grooved, 
both species perfectly agree with one another, D. intermedia 
presenting also a five-rayed star of grooves anteriorly, the frontal 
groove reaching only to the gastricregion. It nevertheless differs 
from .D. sulcata in the presence of a transverse groove close 
and parallel to the posterior margin of the cephalothorax, 
which occurs also in D. brevitarsis. The gastric region bears 
five small tubercles, one on the mesogastric, one on each hypo- 
gastric, and two on the urogastric lobe. The elevated parts of 
the upper surface are minutely granular, as in the other species. 
As regards the inflected portions of the cephalothorax, D. inter- 
media agrees with D. sulcata, the pterygostomian and subhepatic 
regions being sulcate. 
The merus-joint of the outer foot-jaws of D. sulcata is nearly 
twice as large as the ischium-joint, whereas in D. intermedia 
(Pl. TX. fig. 6) it is but little larger. The suture that separates 
these joints from one another is transverse. The ischium-joint 
is nearly quadrangular and smooth. The merus-joint is extremely 
characteristic, and has a more equilaterally triangular form, the 
