252 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



The live animals were carefully studied, the details of their external 

 structure were drawn, and a description was written, but before pub- 

 lishing it it appeared to be desirable to ascertain certain facts about 

 the European species. A letter to Professor Eichters brought a 

 prompt reply in the form of a mounted specimen of B. mirus, sev- 

 eral microphotographs, and a letter suggesting a reexamination of 

 certain details of structure. For proper examination living speci- 

 mens were necessary and a wait of a year was inevitable. 



In 1912 and 1913 and again in 1914 only a single specimen was 

 found and time was lacking to complete the work. In 1915 several 

 specimens were obtained, but so late in the season that an unsatisfac- 

 tory examination only was possible. In 1916 the writer was unable 

 to visit the type-locality, and as it may be several years before he 

 can return, it seems advisable to present what has been ascertained 

 regarding the animal. It may be known by the following descrip- 

 tion : 



BATILLIPES CAUDATUS. new species. 

 Plate 33. 



Holotype.— Cat. No. 49G39 U.S.N.M., and paratypes Cat. No. 

 49G40 U.S.N.M., from Beaufort, North Carolina, collected Septem- 

 ber G, 1911, from Dictyota, obtained from the jetties at the western 

 end of Shackleford Bank. 



Body stout, plump and covered with a finely-granulate, almost 

 transparent skin. Head broad, flattened, and bearing seven cirri, 

 one of which is situated on the median line of the top of the head 

 some distance in front of the eyes; another (paired) is on the 

 frontal border a little to one side of the middle line; another 

 (paired) is below the frontal border about on a line with the mouth 

 and another (paired) is on the lateral border about on a line with 

 the eyes; all the cirri, with the possible exception of the pair near 

 the mouth, spring from papillae and the last one bears at its base 

 an elongate, thin, somewhat triangular flap. The eyes are small 

 and almost colorless. The margins of the body project beyond and 

 somewhat overhang the bases of the legs. On each side near the 

 posterior end there is a slender cirrus and the body terminates in a 

 small, acuminate tail-like process. 



The legs consist of a stumpy basal portion into which the much 

 smaller foot may be partially telescoped. Each leg of the last pair 

 has a stout spine on its posterior surface. The foot consists of a 

 small, knob-like piece to which are attached five, occasionally six, 

 slender toes which are abruptly expanded at their distal ends into 

 thin shovel-like portions. 



The mouth is situated on the ventral surface of the head and 

 opens into a slender esophagus on each side of which is a very small 

 and slender tooth. The teeth do not appear to be forked at their 



