LOVENIA GRISEA. 257 



the middle and the greatest height is clearly well back of the middle. The 

 form of the petals and the tuberculation of the dorsal side is so well shown in 

 the figure, no description is necessary. The posterior end of the specimen is 

 so badly damaged no description of its characteristic features is possible, but a 

 fragment containing the periproct with adjoining plates shows that the region 

 was not at all sunken; the periproct itself is 11 mm. wide and 9 mm. high. 

 There were at least 5 ambulacral plates (and probably more) in the subanal 

 plastron on each side. The tuberculated portion of the sternum seems to be 

 more extensive and the bare ambulacra wider than in gregalis. A fragment 

 containing the peristome shows that it is remarkably small, only 8 mm. across 

 and 4.5 mm. long; it is nearly flush with the surface. Most of the labrum is 

 gone. The general color of both test and spines is gray with a slightly brown- 

 ish yellow tinge. 



The primary spines are all missing or broken but those of the ventral surface 

 were certainly 15-20 mm. long at least. The secondary and miliary spines of 

 the dorsal surface are 1-4 mm. long and very fine, almost silky. In spite of 

 the condition of the specimen five kinds of pedicellariae were found, but unfortu- 

 nately no globiferous. The rostrate, with valves, .40-.60 mm. long, and the 

 tridentate with valves .25-.60 mm. long, are not peculiar but are much like those 

 of other Lovenias; in the rostrate the blade is scarcely half the valve, is rather 

 strongly curved and its width at base is about one fifth its length, while just 

 below the tip it is twice that. Multidentate pedicellariae, with usually 7 valves 

 rather more than a milhmeter long, are present beside the ventral ambu- 

 lacra. The triphyllous pedicellariae have the valves less than .12 mm. long 

 and about .07-.08 mm. wide, so they are noticeably shorter and wider than 

 in other Lovenias. One ophicephalous pedicellaria was found, the onl) r pedi- 

 cellaria of this sort yet recorded in the genus; the valves are short and wide, 

 much as in Breynia (PL 146, fig. SI); they measure less than .20 mm. long but 

 the loop adds .05-07 mm. more. 



Although this species resembles gregalis in some important features, the 

 differences in the shape of the test, in the tuberculation of the sternum, in the 

 form of the petals, and in the pedicellariae serve to distinguish it without diffi- 

 culty. The figure given (PI. 151, fig. 5) is drawn to show the composition as 

 well as the form of the rest; the sutures do not show so plainly in the specimen 

 but they are nevertheless easily seen. Like gregalis, grisea is a deep-water species. 



Station 4080. Off Puniawa Point, Maui, Hawaiian Islands. Bott. temp. 

 56.4°. 178-202 fms. Gy. s., for. 



