1856.] 97 



dorsal and ventral surfaces, -whicli are sometimes finely punctate. Lateral scales 

 nearly 5 times as high as long. Posterior margins of lateral scales bearing a 

 few serrations. 



Anal fin opposite dorsal. 



Radial formula, 



D. 5; C. 14; A. 8?; V. 6; P. ? 



3. M. GBANCLATUS Ncwb. Body fusiform, robust. Length 3 inches, breadth 

 1 lines. Head 6 lines long. Tail 9 lines. 



Head tubercled above, tubercles elongated, with granulations between. Oper- 

 cula, maxillaries and hyoid plates threaded. 



Scales apparently thinner and more delicate than those of any other species. 

 Those on anterior portion of body granulated, and having a faint double waved 

 line along anterior margin. Posterior border serrated. 



Lateral scales 4 times as high as long. 



Radial formula, * 



D. G; C. 14; A. 8;V. 5?; P. 9? 



4. M. LINEATUS Newb. Body fusiform, robust. Length 3 inches ; breadth 8 

 lines. 



Cephalic bones all ornamented with thread-like lines, as in M. corruffaius, and 

 without tubercles. 



Scales of anterior portion of abdomen covered with concentric thread-lines. 

 Margins of lateral scales ornamented in the same manner. 



Lateral scales lower than in any other species yet discovered, greatest vertical 

 diameter only twice longitudinal. 



Scales of abdomen twice as long as broad. 



5. M. ovoiDEUs Newb. Fish small, robust. Body ovoid. Length 1 inch 6 

 lines ; breadth 6 lines. Length of head 4J lines. 



Cranial surface corrugated and finely granulated; opercula and lower parts of 

 head ornamented by thread-like corrugations. 



Scales of anterior portion of abdomen granulated, of sides serrated. 

 Lateral scales 3^ times as high as long. 



6. M. oRNATissiMus Ncwb. Fish small, fusiform, slender. Length 2 inches; 

 breadth 5 lines. 



Cranial surface sparsely tubercled, tubercles somewhat radiated. Spaces be- 

 tween tubercles finely granulated. Opercula, maxillaries and hyoid bones granu- 

 lated and corrugated. All the scales of the body and tail ornamented with 

 granulations, strias or denticles. * 



Lateral scales 4 times as high as long, with a double lipe of appressed denticles 

 on anterior border, and acute serrations of posterior margin. 



Fins all relatively longer than in other species. Dorsal fin nearly opposite 

 anal. 



v. M. INSCL'LPTUS Newb. Body fusiform, slender. Length 2 in. 6 lines, 

 breadth 5 lines. 



Cranial plates ornamented with elongated tubercles, spaces between tubercles 

 granulated. Sides and under surface of head marked by raised lines and fine 

 granulations. 



Scales on anterior half of body highly ornamented. Lateral scales 3J times 

 as high as long, and having a doubled wave line along anterior margin, with 

 acicular denticulations of posterior border. 



Scales of abdomen having entire surface covered with appressed denticles. 

 Scales of tail and posterior portion of body plain. 



Dorsal fin opposite anal. 



8. M. SERRATUS Newb. Small, robust. Length 1 in. 6 lines. Head 4 lines. 

 Tail 5 lines. Breadth of body 5 lines. 



Head finely tubercled above. Opercula, maxillaries and hyoid plates marked 

 by fine linear corrugations. 



