24 THE APODOUS HOLOTHURIANS 



Atlantic coast. There are also two fragments of a Synapta from Sitka, Alaska 

 (Eastern harbor, 16 meters, green mud), which is probably a young individual 

 of this species. These fragments are about 2 mm. in diameter, yellowish, with 

 scattered minute red spots. One is an anterior end and has 10 pinnate ten- 

 tacles, each with 7, 9, or 11 digits and 2 or 3 sense-cups. The calcareous ring 

 and particles in skin are like those of inhcerens, except that the anchor arm? 

 are smooth. All of these peculiarities seem to me to indicate immaturity, but 

 the specimen is strikingly suggestive of Ostergren's Synapta decaria (q. v.). 

 An anterior end of a similar small synaptid with 11 tentacles is in the collec- 

 tion labeled simply "Alaska," and confirms the opinion that the one from Sitka 

 is a young inhcerens. There is also a nicely preserved specimen from Bergen, 

 Norway. I am unable to distinguish satisfactorily between the specimens from 

 Alaska, California, Massachusetts, and Norway. 



LEPTOSYNAPTA OOPLAX (v. Marenzeller). 



There are 18 specimens from Funafuti, of which the largest is about 200 

 cms. long. The calcareous particles are like those of Bedford's variety Icevis 

 from the Loyalty Islands, but there is no little diversity even in a single in- 

 dividual. 



LABIDOPLAX DIGITATA (Montague). 



There are two specimens from Trieste, Austria, of small size, but notable 

 for the large size of the anchors and plates near the posterior end of the body. 

 Many of the anchors are half a millimeter or more in length, but they do not 

 resemble the so-called "giant" anchors of this species. Sense-cups are pres- 

 ent on the tentacles, but I failed to detect a "giant" anchor anywhere. 



LABIDOPLAX DTJBIA (Semper). 



There are five specimens of this species taken off the coast of Japan by 

 the "Albatross" (Stations 3723, 3724, and 3770) in 23-81 m. They agree 

 perfectly with the specimens called "incerta var. variabilis," by Theel ('86a) 

 collected near Japan by the "Challenger." I fail to distinguish them from 

 dubia Semper in any other way than by the presence of sense-cups on the tenta- 

 cles, which Semper says were lacking in dubia. As he only had a single, mutilated 

 specimen, however, I cannot consider this difference of great importance. The 

 specimens before me are 60-70 mm. long and about 4 mm. in diameter, and are 

 of a dirty whitish color, though one specimen shows an evident reddish tint 

 dorsally. There are 5 or 6 sense-cups on each of the 12 tentacles, and 4 digits. 

 The anchors and plates are abundant ; the former are 200-265 //. long ; the latter, 

 180-235 /*. The miliary granules are very scarce and usually have the ends 

 little, if at all, bent. 



