ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 35 
Thoracostracan. It is probably a Stomatopod metanauplius, at a stage 
prior to the Ericthoidina stage. 
New Parasitic Copepods.* * — Staff-Surgeon P. W. Bassett-Smith con- 
tinues his contributions to our knowledge of Copepods parasitic on fishes 
of the Indo-Tropic region. Some fishes, like species of Caranx, are very 
frequently and abundantly infected ; others, such as Sparidm, have rarely 
any parasites, the different character of the food perhaps causing the 
peculiarity. The author describes Bomolochus megaceros Hell. ; Caligus 
longipedis sp. n. from Caranx melamphigus ; C. robustus sp. n. from Caranx 
and Thymus ; the male of C. tenax , not previously described ; Caligodes 
carangis sp. n. ; Alcbion carcharise y of which only a single example has 
hitherto been on record ; the rare Pseudocycnus appendiculatus Hell. ; 
Lernanthropus nudus sp. n. In this last genus the regular flushing and 
pallor of the laminate processes representing the third and fourth tho- 
racic feet at every vascular contraction make it evident that Hesse was 
right in concluding that they act as branchiae. 
Revision of the Pontoniidse.f — Mr. L. A. Borradaile discusses this 
family, which is included in the sub-tribe Monocarpinea, tribe Caridea, 
sub-order Macrura. The diagnosis is given as follows : — Monocarpinea 
with the body often depressed ; rostrum not movable on carapace, 
often short, compressed or depressed, with or without dentations ; outer 
flagellum of first antenna consisting of a thick hairy part, bearing a 
slender hairless part, the latter usually arising from the former at a 
short distance from the free end, and thus giving it a bifid appearance ; 
mandible deeply cleft into two divisions, and always without a jDalp ; 
endopodite of second maxilliped not biramous ; third maxilliped pedi- 
form, but usually with some c-f the joints broadened ; all the legs without 
exopodites or mastigobranchs ; first two pairs of legs chelate, first pair 
slender, second pair larger than the first, not foliaceous. Mode of life 
often semi-parasitic. 
The genera fall into four groups, whose relationships arc illustrated 
by the following scheme. 
Pontonia Conchodytes Coralliocaris Harpilius 
Typton 
Ancli 
istus 
Periclimenes 
North American Centropagidse.f— Mr. E. W. Schacht follows up 
his paper on the North American species of Diaptomus by another in 
which he treats of the three genera Osphranticum, Limnocalanus, and Epi- 
schura. Of these, Osphranticum containing only one species, and Epi- 
schura containing three, are, as far as is known, confined strictly to North 
* Ann. Nat. Hist., ii. (1898) pp. 357-72 (3 pis.). f Tom. cit., pp. 376-91. 
X Bull. Illinois Lab. Nat. Hist., v. (1898) pp. 225-69. 
D 2 
