322 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 11 



Miilleria aegyptiana Heifer, 1912, p. 330, figs. 9-16. 



Holothuria (Microthele) aegyptiana, Panning, 1928, I, p. 137, fig. 21. 



Diagnosis: As for the genus, but tables consistently smaller than in 

 the Atlantic form (largest with diameter of 0.1 mm as compared with 

 0.2 mm). Color white or gray, sometimes with indistinct dark spots in 

 two rows on the dorsum. Atypical buttons in a few specimens. 



Type: Museum of Comparative Zoology. 



Type locality: Zanzibar; also described by Selenka from Hawaii. 



Distribution: From the east coast of Africa, including Mauritius 

 and the Red Sea, to the Panamic region. In the latter part of the world 

 reported from the Galapagos Islands, 2 stations, and from 25° to 28° 

 N in the Gulf of California, so it is probably present along most of the 

 west coast of the mainland. Taken by Ricketts & Steinbeck at Mogote 

 and Puerto Escondido, and NE of La Paz. 



Depth : Found hidden in sand in shallow water. 



Specimens examined: Selenka's types; three specimens collected 

 by Steinbeck & Ricketts; the Hancock expeditions material, consisting 

 of nine typical specimens from six stations and four atypical ones, which 

 possibly in the course of time may develop into a separate local form. 



Remarks: The differences between the West Indian and the Indo- 

 Pacific species are slight, and one might in the end either re-unite them 

 all under the oldest name or split the material up into a number of 

 smaller species. The Panamic material seems to be intermediate between 

 the typical form and the West Indian. The tables in the Panamic 

 material so far collected are not as large as those of the West Indian 

 form, but the long buttons tend to develop the same slender form. Also 

 there is a tendency to greater obliteration of the knobs in the ventral 

 buttons in the Panamic material. 



Panning did not realize that Deichmann's Holothuria fossor was a 

 synonym of Ludwig's Fossothuria cubana, hence the same species appears 

 twice in his account, and unfortunately H. fossor is given as ranging 

 from the West Indies to Amboina and Mauritius. Panning's Indo- 

 Pacific H. fossor should be re-named Fossothuria rigida, while his West 

 Indian Holothuria fossor should be withdrawn as a synonym of Fos- 

 sothuria cubana, as should also H. L. Clark's West Indian Holothuria 

 hypamma and H. rigida. 



12. Jaegerothuria n. gen. 

 (Holothuria inhabilis group) 



Diagnosis: Burrowing forms with small ventral tentacles and small 



