278 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 2 



Genus LIMNICHTHYS Waite 



Limnichthys Waite, Rec. Australian Mus., vol. 5, pt. 3, p. 178, pi. 23, fig. 4, 1904 

 (type species, Limnichthys fasciatus Waite) . 



The species of Limnichthys are separated by the following key (See 

 also table 107) : 



la. Dorsal rays 25 or 26, anal 27 to 29 L. fasciatus Waite 



\h. Dorsal rays 19 to 22, anal 23 to 25 L. donaldsoni, new species 



LIMNICHTHYS DONALDSONI, new species 



Figure 107 



Holotype.— USNM 140906, Bikini Atoll, lagoon reef halfway 

 betv/een Bikini and Amen Islands, July 21, 1947, S-46-442, Brock, 

 Hiatt, and Schultz, standard length 17.5 mm. 



Paratypes.— USNM 140909, Eniwetok Atoll, Rujoru Island la- 

 goon reef, June 2, S-46-195, Schultz, 1 specimen, 18 mm.; USNM 

 140908, EniAvetok Atoll, Aaraanbiru Island, ocean reef, June 3, 

 S-46-198, Schultz, 1 specimen, 20 mm.; USNM 140907, Rongerik 



Figure 107. — Limnichthys donaldsoni, new species, holotype, USNM 140906. Drawn by 



Dorothea B. Schultz. 



Atoll, Bock Island, ocean reef, June 27, S-46-237, Schultz and 

 Herald, 2 specimens, 16 to 17 mm.; USNM 164422, Oahu, off Y\^ai- 

 kiki reef, Dec. 31, 1952, Gosline, Randall and Brock, 1 specimen, 21 

 mm.; USNM 164423, Oahu, off Yv'aikiki, June 4, 1952, Gosline and 

 Brock, 1 specimen, 21 mm. 



Description. — The following counts were made on the holotype and 

 paratypes. Dorsal rays 22, 21, 19, 21, 21; anal rays 24, 24, 23, 24, 

 25; pectoral ra.ys 11-11, 11-11, 11-11, 11, 11; pelvic rays always I, 5; 

 pores in lateral line 36, 36, 37, 35, 37; predorsal scales 17, 17, 17, 

 18; 3 scales between lateral line and dorsal origin and 3 below to anal 

 origin. 



Precision measurements were made on the holotype and one para- 

 type and these data, recorded below, are expressed in thousandths 

 of the standard length. Standard length 17.5 and 16.3. Length of 

 head 315 and 337; greatest depth of body 103 and 117; diameter of 

 orbit 34 and 43; length of snout 69 and 61 ; tip of snout to rear edge 

 of maxillary 126 and 135; postorbital length of head 200 and 196; 



