254 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



noted in either Eupatagus or Gyranopatagus. As the general appearance of these 

 Hawaiian Spatangoids is decidedly more like Gymnopatagus than like any known 

 species of Eupatagus, we place them for the present in the former genus, but it is 

 an open question whether the two genera can be separated. 



Tlie Hawaiian species are of further interest from the remarkable diversity ex- 

 hibited by the peripetalous fasciole, which is seldom a single, simple band. In one 

 specimen there are several narrow but distinct fascioles across the anterior ambu- 

 lacrum, within and parallel to the peripetalous fasciole. In another individual, a 

 conspicuous branch arises from the posterior part of the fasciole and runs for 

 several centimeters beside but slightly diverging from the main baud, aud finally 

 ends abruptly. In other individuals, the lateral portions of the fasciole consist of 

 two parallel bands, more or less connected with each other. Although the com- 

 plexity of the arrangement is never as great as in Macropneustes spatangoides A. 

 Ag., these fascioles at once suggest that West Indian species. 



Gymnopatagus pulchellus A. Ag. and Clark. 



The specimens range from 57 to 90 mm. in length. The largest is 70 mm. 

 ■wide and 33 mm. high ; it is widest and highest just back of the abactinal system. 

 The anterior ambulacrum is apetaloid and scarcely sunken. There are no primary 

 tubercles in the posterior interambulacrum but there are 35-40 in the lateral inter- 

 ambulacra, within the fasciole, arranged in four or five rows parallel to it ; there 

 are also about 20 similar tubercles in each of the anterior interambulacra. These 

 tubercles carry long, slender, brownish-wliite spines, some of which are 30 mm. in 

 length. The posterior petals are very long, about .40 of the length of the test. 

 The smallest specimen is bright rose color above and nearly pure white beneath, 

 though the spines all have a brownish cast. Larger specimens are less rosy and 

 more fawn-color. The test of the largest is nearly uniform fawn-color, with the 

 long spines almost white. 



Station 3810. Off Honolulu Light, Oahu, 53-211 fathoms. 

 3811. Off Honolulu Light, Oahu, 52-238 fathoms. 

 " 4045. Off Kawaihae Light, Hawaii, 147-198 fathoms. 



Six specimens. 



Gymnopatagus obscurus A. Ag. and Clark. 



This species differs from the preceding in the conspicuous groove for the an- 

 terior ambulacrum, the presence of 6-9 primary tubercles in the posterior inter- 

 ambulacrum, the higher and more ovate test, and fewer tubercles in the lateral 

 interambulacra. The specimens are all of about the same size and measure 85 

 mm. in length, by 70 mm. in width and 35 mm. in height. The test is widest at 

 about the middle of the posterior pair of petals, which are nearly as long as in 

 the preceding species. The primary spines are only about 20 mm. long. The 

 color is dull brown, the spines somewhat lighter. 



Station 3912. Off Diamond Head Light, Oahu, 310-334 fathoms. 

 40S1. Off Puniawa Point, Maui, 202-220 fathoms. 



Eight specimens. 



