176 



TERRA NOVA" EXPEDITIOK 



be made out more clearly. The shell was now balanced against the sloping side of 

 the watch glass, so that the uppermost valve was in a horizontal position for drawing. 

 The valves could generally be separated along the hinge-line, simply by opening them 

 out fully and gently pulling them apart at one end. The specimen could then be 

 dissected, and drawings of the parts made in formalin or spirit. 



For permanent preparations the dissection could most conveniently be done in oil 

 of cloves after staining. The best results were obtained by staining in Congo Red, 

 which stains the chitin remarkably well, showing the fine teeth and hairs very clearly. 

 Specimens may be stained for thirty seconds in a half per cent, solution of Congo Eed 

 in ninety per cent, alcohol. ,,, Better results were obtained by diluting this solution with 

 two to ten times its volume of ninety per cent, alcohol, and staining for a longer time. 

 Oil of cloves was used for clearing, and permanent preparations were made of all the 

 species by mounting in Canada Balsam, using a cavity-slide for the larger species in 

 order to minimise distortion. The shells were stained in the same way and mounted 

 along with the dissection. 



The measurements of length were made parallel to the hinge-line from the most 

 anterior point below the rostral notch, and do not include the rostral tooth. 



Ill— LIST 



Codonocera cruenta, Brady. 

 Philomedes assimilis, Brady. 

 Cyclasterope lohiancoi, Miiller. 

 Halocypris glohosa, Claus. 



,, injlata, Dana. 



Conchoecia acuticosta, Miiller. 



,, alata, Miiller. 



„ antipoda, Miiller. 



„ belgicae, Miiller. 



,, hispinosa, Claus. 



,, clmni, Miiller. 



OF SPECIES. 



Conchoecia daphjioides, Claus. 



discophora, Miiller. 



edentata, Miiller. 



hettacra, Miiller. 



imby'icata {pars Brady) Miiller. 



oblonga, Claus. 



serridata, Claus. 



spinirostris, Claus. 



stigmatica, Miiller. 



subarcuata, Claus. 

 Euconchoecia chierchiae, Miiller. 



IV.— LIST OF STATIONS AT WHICH OSTRACODA 



WERE OBTAINED. 



Atlantic (Mostly Tropical). 



Station 39. April 26/27, 1913, 6 miles oif mouth of Rio de Janeiro, 2 metres, 11 p.m-1.30 a.m. 



2.30-5 a.m. 



18° 51' S., 33° 40' W., surface, 4.30-5 a.m. 

 18° S., 31° 45' W., surface, 12.35-1.15 a.m. 

 23° 28' N., 34° 45' W., surface, 1.30-2 a.m. 

 23° 28' N., 34° 45' W., 

 25° 35' N., 34° 10' W., 

 25° 35' K, 34° 10' W., 

 27° 22' N., 33° 40' W., 



