CLARK: THE ECHIXODERMS OF PERU. 349 



Panamic region but extends to the Galapagos Islands. Dr. Coker met with it 

 only in a tide pond at La Boca Grande, Tumbes. These specimens are gray, 

 with an evident purple tinge, and show no trace of the "greenish brown " or 

 " olive " color, to which Verrill (1867) and A. Agassiz (1873) refer. The largest 

 specimen is 63 mm. across, the width slightly exceeding the length. 



Lovenia cordiformis. 



A. Agassiz, 1872. Bull. M. C. Z., 3, p. 57. 



Plate 13, figure 3. 



This is a Panamic species recorded from Guayaquil by Liitken, and although 

 not met with by Dr. Coker it probably occurs on the northern coast of Peru. 

 It is light brown in color, judging from dry specimens, with a decidedly rosy 

 tinge above, especially on the long spines, and yellowish underneath. The test is 

 markedly longer than wide and wider than high; about 50 X 36 X 21 mm. in 

 a fully grown individual. 



Agassizia scrobiculata. 



A. Valenciennes, 1846. Voy. Venus Zoophytes, pi. 1, fig. 2. 



Plate 13, figure 4. 



Originally described from Peru, this curious little sea-urchin has since been 

 found throughout the Panamic region. Verrill (1871) gives the measurements 

 of a large specimen as follows : length, 43 mm. ; width, 40 mm. ; height, 31 mm. 

 The color of preserved specimens is light brown or yellowish gray. Dr. Coker 

 met with this species at Capon, and states that it is common on the mud-fiats, 

 where it is known by the local name " Chimpanzas." 



Sea-Cucumbers. Holothurioidea. 



The holothurians are the least known, and appear to be the least 

 common, of the classes of echinoderms on the Peruvian coast. Al- 

 though seven species are given in the following list, one is known only 

 from the original description of a specimen labeled " Peru," a second is 

 very unsatisfactorily known from a specimen labeled "Chile" but 

 belonging to a warm-water genus, a third is known from Mexico and 

 from Patagonia and hence is assumed to occur in Peruvian waters, and 

 a fourth is a Panamic species, hitherto ver\ ? little known. Of the 

 remaining three, two are southern species, which only reach the lower 

 coast of Peru. Consequently there remains only a single common and 

 well-distributed holothurian on the Peruvian coast. In view of these 

 facts it is futile to discuss the origin of the holothurian fauna. It is 

 only necessary to add that the nearest relative of the common Phyllo- 

 phorus of Peru is apparently some one of the Australasian species. 



