344 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
paired thickenings of the ectoderm which occupy the same position as 
the stigmatic orifices in the germ-stripes of the Tracheata, and which 
are the rudiments of the lateral folds which serve to form the parts that 
correspond to the pleura. 
Formation of Eggs in Testis of Gebia major.* — Dr. C. Ishikawa 
describes the hinder part of the testis of this Crustacean as having, to 
the naked eye, an undoubted resemblance to an ovary. In the anterior 
part or testis proper there extends, along its whole length, a germinal 
band in which young spermatic cells are to be found ; the ripe 
spermatozoa are of nearly the same shape as those of Gebia littoralis 
described by Grobben. 
In the hinder part of the organ there is still the germinal band, but 
its cells are differentiated into egg-cells of large size. At one point 
male and female cells lie among each other. 
This condition of things obtained in all the twenty males examined ; 
all the males are well characterized by secondary sexual characters, so 
that we have a new case of male animals producing in part the female 
elements. Here, as in the similar case of Orchestia, the eggs do not 
pass out of the generative organ ; the author thinks that the eggs 
atrophy at certain seasons of the year. 
Mediterranean and Atlantic Halocyprides.f — Prof. C. Claus gives 
an account of the genera and species of this group of Ostracoda, with 
notes on their organization. The chief anatomical characters of the 
family are the absence of the paired lateral and the trifid median eyes; 
the heart is short and saccular, with a hinder dorsal pair of clefts and 
an anterior arterial ostium, and lies above the stoma -h. At the com- 
mencement of the stomach there are two short, saccular, hepato-pancreatic 
tubes, which do not pass between the shell-fold. There is no anus, in 
consequence of the degeneration of the hind-gut. The paired gouads 
lie symmetrically and dorsally by the sides of the stomach. The male 
has a copulatory organ on the left side which is forme I by the union of 
two metamorphosed appendages of that side. The copulatory orifice and 
the receptaculum seminis lie on the right side of the body of the female, 
and the egg-pouch on the left. The ova appear to be deposited separately. 
The young, on emergence, appear to have their full complement of 
limbs, and only differ from sexually mature animals by the smaller size 
of the body aDd its extremities, and some unimportant points, such as 
the smaller number of furcal hooks ; in some points the young male has 
the characters of the female. 
The first subfamily is that of Conchoecinae, in which are included 
C nchoeci a Dana ( C . subarcuata, bispinosa, Jiyalopbyllum , porreda , and 
striata spp. nn.) ; Paraconchcecia g. n. for P. oblonga , spinifera , inermis , 
and gracilis spp. nn. ; Conchcecetta g. n. for C. acuminata sp. n. ; Con- 
choecilla g. n. for C. daphnoides sp. n. ; Conchoecissa for C. armata sp. n. ; 
Pseudoconchoecia for Conchcecia serrulata Claus ; Mikroconchoecia for 
Halocypris Clausi Sars. The second subfamily is that of the Halo- 
cyprinse for Halocypris Dana ( H ’. pelagica and distincta spp. nn.) and 
Halocypria Claus. 
* Zool. Anzeig., xiv. (1891) pp. 70-2. 
t Arbeit. Zool. Inst. Wien, ix. (1890) pp. 1-31. 
