ECllLNOCVAMUS ELO.NGATUS. 61 



twice as wide as interambulacra at ambitus. Primary tubercles relatively large, 

 evidently larger than genital pores. Glassy tubercles rounded and inconspic- 

 uous. Madreporic pore smaller than a genital pore. 



The holotype and five other specimens in the M. C. Z. collection are all 

 from ]Mauritius. They are bare tests, received from Mrs. Luckock some forty 

 years ago. 



This is certainly the most distinct and easily recognized member of the 

 family, and is not especially near any of the other species of Echinocyamus, 

 the large and rather ornamental petals being quite distinctive. All of the 

 specimens are white and have the appearance of being shghtly water worn. 



Echinocyamus minutus. 



Echinus minutus Pallas, 1774. Spic. Zool, 10, p. 34. 

 Echinocyamus minutus de Blainville, 1S34. Man. Act., p. 214. 



When Pallas's description of his Echinus minutus is carefully examined in 

 connection with his fig. 25, pi. 1, and due consideration is given to his remarks 

 about habitat and occurrence, it is almost impossible to doubt that his name 

 was given to the fibulariid which O. F. INIuller two years later called Spatagus 

 pusillus. Although Echinocyamus pusiUus is the name used in the Revision and 

 other later publications, I am therefore obliged to replace it with Echinocymnus 

 minutus (Pallas). 



Echinocyamus elongatus/ sp. nov. 

 Plate 126, figs. 9-11. 



Length, 9 mm.; breadth, 6 mm.; height, 2.6 mm.; mouth about 1.5 mm. 

 across and periproct about .8 mm. Test long, low, flat and rather narrow for a 

 fibulariid. Apical system decidedly anterior to center. Mouth somewhat 

 sunken and test posterior to it decidedly concave. Petals distinct and well 

 formed but rather short. Poriferous areas nearly parallel, each with about ten 

 pairs of pores. Periproct about midway between mouth and margin. Genital 

 pores larger than ocular pores. Radiating partitions within test fairly well 

 developed. Auricles rather low, but wide. Ambulacra scarcely twice as wide 

 as interambulacra at ambitus. Horizontal series of ambulacral pores distal 

 to petals, conspicuous. Primary tubercles large, lai'ger than genital pores. 



' elongatus = lengthened, in reference to the form of the te.st. 



