78 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Alteutha inter rupta occurred sparingly in the collection 

 made between Liverpool and the north of Ireland. 



One specimen of an interesting parasitic species, Noga- 

 gus borealis, was found in one of the mid-Atlantic collec- 

 tions. It was first recorded by Steenstrup and Liitken 

 in 1861, from a specimen found free swimming in the 

 South Atlantic. Other members of the genus Nogagus 

 are known to be parasitic upon sharks. This was the only 

 parasitic form found in the collections. 



The description of the three new species* is as follows : 

 Eurytemora herdmani, n. sp. (PI. V., figs. 1 — 11.) 



Length (exclusive of tail setae), 1"6 mm. Body ovate 

 anteriorly, the posterior angles being produced in the 

 female into large conspicuous wing-like expansions (fig. 1). 



Anterior antennae (fig. 2) about as long as the cephalo- 

 thorax ; 24-jointed in the female, 21-jointed in the male 

 right antenna (fig. 9). The proportional lengths of the 

 joints in the female antennae are as follows : — 

 12 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 

 36 10 8 8 8 6 7 5 6 5 5 8 13 14 15 16 17 18 18 18 16 16 19 26 

 Each joint bears one or more setae on the upper surface. 

 The 17th and 18th joints of the right male antenna (fig. 9) 

 are finely denticulated on the upper edge ; a geniculation 

 being between the 18th and 19th joints. The apical joint is 

 very small, the previous joints being much longer than 

 any of the others. Posterior antenna (fig. 3) similar to 

 that of E. clausii, with the exception of the setae being 

 non-plumose. 



The mouth organs follow the general character of the 

 Calaninae. The mandibles (fig. 4) are large and powerful, 



* See also description of a new species from Puget Sound in Appendix, 

 p. 87. 



