LOVENIA CAMAROTA. 253 



Lovenia camarota, sp. nov. 1 

 Plate 161, figs. 1-4. 



Length 53 mm.; width at apical system, where widest, 42 mm.; height 

 at apical system, 18.5 mm.; height back of apical system, where highest, 22.5 

 mm. The form of the test, its tuberculation, the appearance of the petals, and 

 the slight depression of ambulacrum III are clearly shown in fig. 1; the keel- 

 like elevation of interambulacrum 5 and the slight prominence of the subanal 

 plastron are shown in fig. 2; the very bare actinal surface, the nearly flush 

 peristome and the deeply sunken periproct are evident in fig. 8; while the inter- 

 ambulacral keel and the position of the periproct is brought out in fig. 4- The 

 internal fasciole and the 4 genital pores are very distinct in the specimen, but 

 do not show well in the figure. The periproctal depression is nearly circular, 

 12 mm. across, but the periproct which is on its upper side is only 5 mm. high 

 by 6 mm. across. The subanal fasciole is distinct and the plastron it bounds 

 is 20 mm. wide, 9 mm. high at each end and only 4.5 mm. high in the middle. 

 On each side of the plastron are about 15 large primary tubercles more or less 

 deeply sunken in the test; on the right side 6 ambulacral plates enter the plas- 

 tron with 5 pairs of pores but on the left side only 5 ambulacral plates enter the 

 plastron and there are only 4 large pore-pairs. The labrum is 10 mm. long and 

 about 3 mm. wide where widest; it adjoins just two ambulacral plates on each 

 side but the second one is notably prolonged to reach the tip of the labrum. 

 The primary spines are all broken or missing and most of the secondary and 

 miliary spines are rubbed off. The color of the test is light gray with more or 

 less of a brownish tinge especially where any spines are left; ventrally and pos- 

 teriorly where rubbed the test is nearly white. 



In spite of the condition of the specimen, two kinds of pedicellariae were 

 found, rostrate and tridentate. The former have valves so strongly curved 

 that measured on the arc they are about .45-.55 mm. long but measured on 

 the chord they are only .38-45 mm.; the blade is very narrow, not enlarged 

 but finely toothed at the tip. The tridentate have valves .30-.35 mm. long, 

 narrow, compressed, and straight; the margins were cut with squarish notches 

 giving a very unusual, somewhat unfinished appearance, but as there was only 



1 Katxapurdi = arched; in allusion to the highly arched interambulacrum 5. 



