73 



NOTES ON SPECIES. 



1. Calanus minor (Claus). A few forms -agreeing well with 

 this species were found in the plankton, the only difference noted 

 being their somewhat smaller size. 



2. Eucalanus sp. Only a single specimen of this genus has 

 been found in the material from the plankton and the lack of suf- 

 ficient material has, of necessity, prevented any critical study 

 beyond fixing the genus. 



3. Ceiilropagcs typicns Kroyer. 



4. Ceniropagcs furcatus (Dana). 



5. Centropagcs sp. 



The first two of these forms were present in the material from 

 the plankton. C- furcatus was comparatively common, while 

 only one or two specimens of C. typicus were noted. C. fur- 

 catus was also present in material from Calcasieu Pass. A third 

 species of the genus, agreeing in some respects with C. hamatus 

 (Lillj.) was given cursory study at the Station, but the pre- 

 served material has failed to furnish further specimens. The 

 presence of hooks on the ist, 2d and 5th joints of the anterior 

 antennae place it near to C. furcatus, but the genital segment is 

 almost symmetrical. 



6. Eurytemora afUnis (Poppe). The presence of one or two 

 individuals of this genus in the material from Calcasieu Pass is 

 of interest, proving, as it does, that its range includes the whole 

 of the Gulf httoral. 



Plerrick ('84, p. 182) was the first to record and describe the 

 species in America from the "shallow bays and estuaries along 

 the Gulf of Mexico" under the name of Temora affinis Poppe, 

 noting its habitat as littoral and range from salt-water bays to the 

 fresh waters of rivers. He later extended his description ('87, 

 pp. 7-10; pi. I, figs. 3-6 and pi. II, figs. 9, 10) under the name 

 of TcuioreUa affinis Poppe, and gave the salient characters separa- 

 ting the genus Temora of Baird ('50) from Temorella of Claus 

 ('81). Giesbrecht ('81) erected the genus Eurytemora, the ques- 

 tion of priority between him and Claus resting on the fact that 

 whereas Giesbrecht's paper was published on May 16, 1881, Dr. 

 Claus' memoir was only "read" on May 12, 1881, and its publi- 

 cation would necessarily be after that of Giesbrecht's. Zoologists 

 have adopted Giesbrecht's genus and Herrick ('95, pp. 49-53) 

 subsequently noted the form under Eurytemora. 



De Guerne and Richard ('89, p. 88) note Herrick's record as 

 a definite variety of the type, and for this opinion there may have 



