110. Miscellaneous. 
the pleon are more distinctly indicated and there is a well-developed 
pair of uropoda. As to the thoracic feet, they are of the normal 
number of seven pairs, of which the first and smallest belong to a 
narrow segment soldered to the head, which has escaped the notice 
of G. O. Sars. The prominent rostrum and the very long outer 
antenne very closely resemble in form the same organs in the 
Cryptoniscians. The passage from the Dajidee to the Cryptoniscians 
may be understood in the following manner :—In the male the 
development has been arrested in the Cryptoniscians at the second 
larval form, whilst in the Dajide there has been a transformation 
into a degraded male. In the female the anterior part of the incu- 
batory chamber has been considerably contracted in the Crypto- 
niscians, whilst a cavity was formed at the expense of the lateral 
folds and of the posterior part of the body; but this cavity cannot 
be in any way confounded, as suggested by Fraisse, with the ccelo- 
matic cavity. The profound modifications of the incubatory cavity 
of the Dajide and Cryptoniscians will be examined in detail in a 
memoir with plates. It may be observed, in conclusion, that the 
Erythrops microphthalma parasitized by A. Sarsi was a female 
destitute of ova, no doubt owing to parasitic castration.—Comptes 
Rendus, May 13, 1889, p. 1020. 
A Parasitic Copepod. By Prof. Lery. 
The author stated that last summer while at Beach Haven, 
N. J., there was brought to him from the surf a living specimen of 
the singular transparent fish Leptocephalus. In examining it he 
observed attached to the tail-fin a minute Copepod Crustacean, 
apparently of the genus Chalimus. The parasite was attached by a 
long filiform rostrum, and resembled in this and other respects more 
the Chalimus Scombri as represented by Baird in fig. 5, tab. xxxili. 
of the ‘ British Entomostraca, than it does the original of this 
species as represented by Burmeister in the Nova Acta Nat. Cur. of 
Bonn, xvii. tab. xxiii. fig. 13. The species, which may be distin- 
guished as Chalimus tenuis, is considerably less than half the 
size of C. Scombri. The cephalothorax, nearly twice as long as 
broad, is obcordate and proportionately much narrower than in 
the latter species. The frontal segment is narrow and not promi- 
nent laterally, and the biarticulate antennz are concealed beneath. 
The abdomen, half the length of the cephalothorax, exhibits three 
conspicuous divisions, and the short caudal appendages end in three 
minute sete. Abdominal feet ending in biramose leaf-like seg- 
ments fringed with short sete. Rostrum linear and almost as long 
as the cephalothorax. Whole length 1:125 millim.; length of 
cephalothorax 0:5, breadth 0-275; length of rostrum 10°5; length 
of abdomen 0°25.—Proc. Acad. Nat. Set. Philad. April 16, 1889, 
p. 99. 
