CALANOID COPEPODA FROM THE BERMUDA ISLANDS.^ 



By Calvin 0. Esterlt. 



Presented by E. L. Mark, May 10, 1911. Received May 12, 1911. 



The copepods mentioned in this paper were collected during June, 

 July, and August, 1907. A small " open " plankton net was used, and 

 both vertical and horizontal (surface) towings were made, but there is 

 no special significance in vertical collecting with a non-closing net. 

 Most of the collections were made close to Agar's Island. In addition, 

 four hauls were made about two miles north of North Rock, three of 

 these being vertical from about twelve fathoms. 



The calanoid copepods are represented in Bermuda by five genera, 

 one of which is new, and six species of which four are new. The list 

 is as follows : Acartia bermudensis n. sp., Acartia spinata n. sp., Cal- 

 anopia am&ricana Dahl, Clausocalanus furcatus Brady, Lampoidopus 

 marJci n. gen., n. sp., Pseudocyclops magnus n. sp. I have given here 

 very brief characterizations of the species previously described by 

 others, as a basis for comparison with similar forms from other locali- 

 ties, and drawings of certain parts have been included for the same 

 purpose. New forms are described and illustrated more fully. 



Lampoidopus^ marki' n. gen., n. sp. 



Plate 1, Figure 4 ; Plate 2, Figures 13, 14, 20, 21 ; Plate 3, Figures 25, 26, 

 28, 29, 30, 31, 34 ; Plate 4, Figures 35, 38, 42. 



The head and posterior margin of the last thoracic segment are 

 smoothly rounded in both sexes (Plate , Figure 4 ; Plate 2, Figures 14, 

 21). There are five segments in the cephalothorax of both male and 

 female, the head being fused with the first segment of the thorax. The 

 rostrum is present and consists of a fleshy rounded plate, which at its 



^ Contributions from the Bermuda Biological Station for Research, No. 21. 



2 Aa/i7rds, torch, eldos, like, irovs, foot, in allusion to the fancied resemblance 

 of the last two joints of the outer ramus of the left fifth foot to the conven- 

 tional representation of the flames of a torch (see Plate 3, Figure 34). 



^ The species is named for my teacher, Dr. E. L. Mark. 



