252 HAWAIIAN AND OTHER PACIFIC ECHINI. 



wanting. Another characteristic pedicellaria in Lovenia may be called multi- 

 dentate, i. e. tridentate pedicellariae with more than three valves; there may 

 be 4 valves in which case the separate valves are much like those of the true 

 tridentate; but when there are 5, 6, 7 or even 8 valves as is often the case, 

 the valves assume a different and characteristic form with a compressed base 

 and sometimes with a modified blade. Often these pedicellariae have a long 

 neck but this is not always the case. Mortensen has found a somewhat similar 

 pedicellaria in Brissopsis, probably a case of "parallelism" as the genera are 

 probably not very nearly allied. Neither Koehler nor Doderlein seem to have 

 met with these multidentate pedicellariae, but Doderlein describes and figures 

 a form of tridentate, having base and blade of equal length and the blade imper- 

 forate, which I have not found. 



Key to the Species of Lovenia. 



Genital pores 4. 



Periproctal region markedly sunken into posterior end of test. 

 Test broad and flat, its width exceeding .75 of its length. 



Test highest at, or anterior to, apical system; 6-10 large pores-pairs on 



each side of subanal plastron elongata. 



Test highest in the somewhat carinate interambulacrum 5 back of apical 



system; only 4 or 5 large pore pairs on each side of subanal plastron . camarota. 



Test narrower and higher, its width about .75 of length or less cordiformis. 



Periproctal region little or not at all sunken. 



Test narrow, width .75 of length or less; large dorsal primary tubercles few . . subcarinata. 

 Test wide and flattened, width .80 length or more; large dorsal primary 

 tubercles numerous. 



Test not heart-shaped, its width .80-85 length gregalis. 



Test heart-shaped, its width .90 length or more grisea. 



Genital pores 3 triforis. 



Lovenia elongata. 



Spatangus elongatus Gray, 1845. Eyre Voy., 1, p. 436. 



Lovenia elongata Gray, 1851. Ann. Mag. Nat, Hist., (2), 7, p. 131. 



This species ranges from Zanzibar and the Red Sea to northern Australia 

 and Japan. The pedicellariae have been described and figured by both Koehler 

 and Doderlein. I am unable to account for Mr. Agassiz's statement that this 

 species was collected in the Gulf of California by W. J. Fisher as shown by speci- 

 mens in the M. C. Z. Collection. All the Lovenias collected by Fisher and now 

 in the M. C. Z. collection are cordiformis. 



