442 DR. J. D. MACDONALD ON A NEW CIRRIPED. [June 24, 
The palps (d) consist of a base and a simple oral terminal seg- 
ment, with a brush of hairs at its extremity. 
The mandibles (e) present six prominent teeth, diminishing in 
size from before backwards—the sixth or apical tooth being notched, 
so as to give the indication of a seventh. 
The maxille (f/) support four or five principal conical points, or 
teeth, upon a slightly oblique but straight edge. 
The external maxillze (gy) are quite membranous, of rhomboidal 
shape with rounded angles, setaceous on their inner surface, and 
capable of meeting together below the maxille, so as to answer the 
purpose of a labium. 
The branches of the first pair of cirri (4) are richly bristled, and 
nearly of equal length and thickness. 
Assuming this little cirriped to form the type of a new genus, it 
may be named Parodolepas* neptuni, with the following generic 
characters, subject, of course, to such revision as may be ultimately 
found necessary :— 
Valves five, approximate, transparent in their general extent, but 
strengthened by the deposit of shelly matter, after the manner of 
the rudimentary valves of Dichelaspis, without, however, overlapping 
each other, as they are circumscribed by their respective plates. 
Carine not extending beyond the base of the terga, and meeting the 
scuta in a straight longitudinal line. Mandibles with six teeth, gra- 
dually decreasing in size from before backwards; the sixth or apical 
tooth notched, giving an indication of a seventh. Maxillee support- 
ing about five principal conical points, or teeth, upon an oblique 
but straight border. Anterior and posterior ramus of the first cirri 
nearly equal in length and breadth, and well clothed with hairs. 
In a subsequent cruise to Nandi Bay, Vanua Levu, Feejee, I met 
with a second little pedunculated cirriped, parasitic upon another 
swimming crab; but I regret to say that, although I made rough 
drawings of the oral organs and one or two of the cirri (see the 
woodcut, p. 443), I did not think it worth while to compare the 
capitulum with that of the species above described ; but, as far as I 
can remember, it presented very similar characters. 
The palps (a) presented an oval extremity crested with hairs ; 
and the mandibles (4) were four- or five-toothed, the two or three 
terminal ones being subdivided irregularly. 
The maxillze (¢) were comparatively short, and furnished with 
numerous points upon a slightly convex border, the two or three 
outer ones being separated from the rest by a shallow notch. The 
external maxilla (d) were small, and closely beset with long hairs 
upon their inner surface. 
The anterior branch of the first pair of cirri (e) was very short as 
compared with the posterior, the segments of both being armed with 
transverse rows of hairs in front, but quite nude posteriorly. If 
this inequality in the size of the two branches of the first cirrus be 
not of generic importance, it is probable that the species may be 
referable to the genus Dichelaspis. Some future inquirer may be able 
* Tdpoéos, transition; the specific name neptuns expresses the habitat. 
