IO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



Pleuroncodes planipes Stimpson S° — 



About 11 : 00 o'clock at night, Lt. H. K. Gates, one of the engineer 

 officers, called me to the engine room to see a lot of bright red shrimp 

 they had discovered in the suction side of one of the condensers 

 opened for minor repairs. They proved to be the galatheid shrimp, 

 P. planipes, very common in Lower California waters at certain 

 seasons. At times they occur in such countless numbers that they 

 color the water red for great distances. Huge windrows of the dead 

 shells of these animals have been observed in the past as conspicuous 

 red streaks along the shore line. Crustaceans of this type form an 

 important whale food and without doubt this species played an 

 important part in the former abundance of whales in the Lower 

 California!! and Mexican waters. As noted above, a large black sea 

 bass taken in Magdalena Bay during the day regurgitated several of 

 these galatheids when hauled into the boat. 



Socorro Island, Mexico, July 20 (sta. 6-38), shore collecting, 

 Braithwaite Bay, at landing place. 



Crangon species 1 



CALLIANIDEA LAEVICAUDA OCCIDENTALS, n. subsp. 



Holotype. — An ovigerous female (U.S.N.M. no. 77788) about 

 48 mm. long from rostral projection to end of telson, accompanied 

 by a male approximately 35 mm. long and a very small male, perhaps 

 juvenile, 18 mm. long. The upper margin of hand from posterior 

 extremity to tip of movable finger measures about 17 mm. in the 

 holotype and 13 mm. in the larger of the male specimens. 



Description. — About 10 years ago I determined two specimens of 

 Callianidea laevicanda from the Tres Marias Islands, Mexico, for 

 Senor Carlos Stansch, at that time an agent of the Direccion Forestal 

 y de Caza y Pesca of Mexico. In those specimens, as in these from 

 Socorro, most, if not all, of the pleopod filaments are two-jointed. 

 Moreover, Pacific specimens of C. lacvicauda have the greater part 

 of the length of the lower margin of the large chela more or less 

 toothed or tuberculate and the ridge on the inner side of the fixed 

 finger crenulate. Atlantic specimens which I have examined from 

 Puerto Rico, Culebra, Barbados, and Curagao have the lower margin 

 of the large chela only very slightly roughened or, at most, obscurely 

 crenulate at about midlength only, whereas the ridge on the inner side 

 of the fixed finger is smooth. Otherwise, there seems to be little 

 difference between the two forms, and such differences as I have 



