186 Annals of the Carnegie Museum. 



description. The pectoral reaches well past the front of the anal. In 



the key to the genus the character of the interorbital space for the two 



species has been transposed. The key should show the interorbital 



space scaled over for RadiiUniis boleoides and naked for RaduUnus 



asprcUus. 



21. Radulinus boleoides Gilbert. 



Two male specimens were taken in the dredge in deep water; the 

 only ones known since the single typical specimen was taken off the 

 Island of Santa Catalina, southern California. They measure re- 

 spectively 135 and 140 mm. in length. They differ only from the 

 description of the type as specimens twice as long as the type might be 

 expected to, though there is some variation shown in the number of 

 fin-rays and lateral plates. 



The head is 3.87 in the length to the caudal base; the depth 7. 

 The eye is 3.75 to 4 in the head; the snout 3; the maxillary 2.75. The 

 dorsal numbers X-21; the anal 22; the pectoral 20. There are forty 

 plates in the lateral series in both specimens. The upper preopercular 

 spine is broad, and not very sharp; the lower one very broad, or in 

 the larger specimen only forming a slight angle; the two rounded 

 processes below are scarcely indicated. The supraorbital rim is 

 slightly raised, so that the interorbital space is concave. The fila- 

 ments on the eye and occipital region are very minute in one specimen, 

 and difficult to find, but they are present in both. The pectoral reaches 

 to the base of the fourth or fifth anal ray. 



The differences between this species and RaduUnus asprcUus may 

 be here repeated with some additions. The head of RaduUnus 

 boleoides is more completely scaled. Instead of a narrow v-shaped 

 band about one scale wide at the posterior part of the eyes there is 

 a band two or three scales wide. The interorbital space is scaled 

 over, and the scales follow the anterior margin of the eyes. There is 

 a transverse band of scales across the occipital region. The opercles 

 and cheeks are more completely scaled. The lateral series of scales 

 are rounder in outline, not so evidently keeled and angulated behind, 

 and narrower in vertical width. The eye in particular is much smaller; 

 the nasal spines are smaller and slenderer. RaduUnus boleoides has 

 minute supraorbital and occipital filaments. The dorsal spines are 

 much higher, the tips of the longest spines when depressed reach to 

 the fourth or fifth dorsal ray, while in the male of RaduUnus asprcUus 

 they reach scarcely past the front of the soft dorsal. 



