on some new Entomostraca. 13 



the Entomostraca of Sweden," * has expressed a similar opinion, 

 and gives the cliaracters of Teinora, as follows : — " Caput a thorace 

 qiiinqiie annulato disjunctum, unum annulum praebens. Abdomen 

 thorace angustius, quatuor-sex articulis compnsitum. Antennae 

 secimdi paris biramosae. rarao exteriore articulis septem composito. 

 Palpus raandibularum biramosus, vel appendice branchiali mem- 

 branacea et setifera prseditus. Maxillae vel pedes maxillares 

 prinii paris laminosae, lobulos plures setiferos, secundi paris breves 

 et crassae, processus phires setiferos, setis longis plumosis, amice 

 vergentibus, gerentes ; tertii paris elongatae pediformes, siniplices 

 articulis sex compositae, setiferae, ant ice vergentes. Ramus inte- 

 rior pedum primi paris inarticulatus, et secundi-quarti paris 

 biarticulatus. Pedes quinti paris antecedentibus dissimiles, 

 dexter maris subchehformis. Oculus unicus. Sacculus oviferus 

 unicus." 



I may observe, however, firstly, that Professor Dana's labours 

 have shown that the number of segments of the cephalothorax, 

 abdomen, and of the branches of the natatory legs, though useful 

 as specific characters, vary in species of the same genus ; and, 

 secondly, that though we may think it probable that the right 

 male antenna of C. Finmarchicus may be prehensile, we do not 

 know that it is so. Li1gel)org's Temora vetox appears to me to 

 belong to Westwood's genus Diaptornua. If, when we are ac- 

 quinted with the male of Calanus Finmarchicus, we find that it 

 agrees generally with that of the species which I have named 

 Diaplomus dubius, it will become a question whether the genus 

 " Diaplomus " will not have to be abandoned, as synonymous with 

 " Calanus.'' A new genus must, in that case, be formed for the 

 species described as Calani by Kroyer, Dana and myself. 



I have observed spermatic tubes on Euchceta Atlantica, and 

 Undina longipes in one or two instances was furnished with two 

 or three small tubes about a quarter as long as the abdomen, and 

 with long thin necks. There are, perhaps, also spermatic tubes, 

 although I observed them on males. In the genus Corycceus there 

 are generally one or two bags attached to the upper side of the 

 abdomen, which may be of the same nature. 



Calanus. 



I. Setae antennarum anticarum apicales subapicalibus longiores. 

 A. Styli caudales curti. 



* Ora de inom Sltane forekommande Crustaceer af ordinngarne ClaJocera, 

 Ostracoda och Copepoda. 



