Marine Copepoda 39 k 



spinulose anal valve as figured by Sars. In the first leg B2 has an ental spine 

 set upon a prominent rounded boss and an equal ectal spine on the anterior 

 surface (Fig. 59). 



Fig. 59. Tachidius brevicornis. 

 First leg, anterior surface. 



31. Danielssenia fusiformis (Brady). 



I have identified a single individual of this species from Station 25 b, c, taken 

 at the surface close to ice, north of Cooper island, Alaska, August 27 and 28, 

 1913.^ The length was about 0-85 mm. As a Danielssenia, its distinguishing 

 feature is the 5-jointed antenna, but in the specimen this is not so decisive as 

 could be desired. The terminal part of the antenna seems at a certain focus 

 to consist of two joints. The antpnnse carry a number of conspicuous thorny 

 bristles, three of which are especially prominent upon the basal half of the 

 terminal portion and one of them is inserted at the level where the articulation 

 should occur. This bristle was lost on one antenna and its sharply defined 

 broad base of insertion simulated an interarticular junction. The basal seta of 

 the posterior maxilliped was damaged accidentally in the manipulation. The 

 fifth foot accords with the figure by Sars. 



Neither Brady nor Sars seems to be entirely satisfied as to the distinct- 

 ness of D. typica and D. fusiformis, and the differential characters advanced 

 by Brady are not those upon which Sars relies. 



32. Danielssenia stefanssoni, n. sp. 



Station 41n. See under Dactylopusia. 



Station 41s. See Table VI. 



Station 42p. Dolphin and Union strait, surface-tow, with net number 3, 

 10 minutes, Bernard harbour (outer harbour), water depth three fathoms, 

 September 30, 1915. 



Table XIX (Sta. 42p). 



Pseudocalanus elongatus 12 (young and adult). 



Ewytemora herdmani 3 (males). 



Oithona similis 4. 



Harpacticus uniremis 11 (males and females). 



Idyaa furcata 2 (females) . 



Danielssenia stefanssoni 5 (females) . 



Length of female, 1-226 mm. Rostrum prominent, defined behind. Caudal 

 rami slightly exceed anal segment as 10 : 9. Anterior antennae 6-jointed with 

 following relative lengths of joints: 13, 10, 7, 4, 5, 5. Posterior antennae with 



1' See Table III. 



