290 PROCEEDIXGS OF UNITED STATES NATIONAL MUSEUM. 



Table 11. 



Tliis table enuiuerates in brief the characters of the siinis of tlie girdle 

 and its armature, and the chief distinctive peculiarities of each group. 



Simple, smooth, deep 

 Simple, broad 



9 

 10 

 )1 

 11a 

 12 



12a 



i:i 



14 



1'. 



16 



16(1 



17 



ISfl 



iHc 

 ISd 



18c 

 IRf 

 JHg 



l?ft 

 19 



21 



23 



24 

 ■25 



25a 



26 



•26a 



Simple, liroad, shallow- 



Broad, spongy 



Obsolctf 



Broad, shallow . .. 



do 



Extremely small . 



Most minute . . 

 Broad, shallow--. 

 Broad, fissured - - 



Modernte. 



Broad or minute- 

 Broad, smooth-.. 



Simple, broad, deep. 

 do 



Simple, narrow, deep . . 

 Simple, broad, shallow- 



.do 

 -do 



f Broad, shallow, some- 

 i times dentate. 



Broad, shallow, laminate - 



^^arrow, deep, laminate. . 

 Narrow, shallow, simple - 



Rounded, simple - - . . 



Narrow, shallow, simple - 



Broad, shallow, simple. 

 Squared, denticulate .. . 



.do 



do 

 .do 



27 i Small, laminre united. 



(?) 



Large, laminae united. 



Girdle. 



Gravelly scales, eraooth or striated 

 Spicules and chatty scales 



"With hairs or fine spines 



Solid, downy, poi if^rous 



Thill, horny, tiiiely grauulous 



Granular tiattish "scales , 



do 



Long, horny scales , 



Peculiarities. 



Smooth, downy 



Smooth or downy 



Smooth 



Thin, smooth 



Hairy 



Short, striated, shelly bristles . 



Spongy, downy 



Irregular, chatfy scales 



. do 



Long, striated spines and scales. 

 iJoublo series scales, not chaft'y . 



Small, transverse scales. 

 do 



Large, smooth, imbricated scales . 



Narrow, with small scales 



Smooth; with marginal tufts 



Minute bristles and suturalhair- 



tults. 

 Fleshy with long, haii-y bristles 

 Smooth, with horny processes 



Spongy, with scattered soft hairs. 

 Large, solid, imbricate scales 



.... do 



Smooth or downy. 

 Smooth, spreading 



:30a 

 306 

 30c 



.31 



U2 



:32a 

 3i 



■34 



.35 



:30 

 36a 



37 



38 



Large, waved, laminae 

 i united. 



(?) 



Hairy 



"Minutissime a.sperulus" . 

 Large, solid, grooved scales. 



Shelly bristles 



(Large, waved, lobed, lam-( 

 i in<E united. ) 



Minute, waved, smooth 



Simple, laminae separated.. 



.do 

 .do 



Narrow, smooth, laminate. 

 Narrow, Inminas separated. 



Nai row 



Narrow, lobed 



Narrow, very deep 



Dei p, lobed 



do 



Shelly spines 



Shelly bristles, spreading .. 



Smooth, small, downy tufts 



Granular bristles 



Bristly, striated scales 



Broad, with shelly bristles. 



Thin, lanugate 



Thin, lanugate, wide, with sutural 



])ores. 

 Slit behind, solid smooth scales.. 

 Produced in front, upiight scales. 



Slit behind, minute spiculfE 



Large, separate scales, bristles 

 between. 



All negative. 



Flaitencd niucro, valves thrown 

 forward 



Lamina; only on anteiior valve. 



Terminal valves laminated. 



Uuslit lamina) on all valves. 



Short gills, granular scales. 



lladsioid central slits. 



Suiall sinus, reticulate girdle, 

 crowded propped teeth. 



Smooth girdle. 



Shoit gills, ischnoid plates. 



Valves slit in dorsal axi.s. 



Teeth f(^w, valves parity immersed. 



Ischiuiid plates, hairy girdle 



Iliidsioid slits ischnoid plates, stri- 

 ated bristles. 



Half immersed valves, plates isch- 

 n'>id. 



Body long, chatfy scales. 



Same ns last, with radsioid slits. 



Same, triple series if striated scales. 



Body normal, double series of 

 scales. 



Body iioinial, small striate scales. 



Body normal, radsioid slits. 



C Sc.ili's of Chiton, plates of Ischno- 



< chiton. 



( Same, with rad.sioid slits. 



NiaTiiw yitdle, higldv .sculptured, 

 plati s curv.'il oul waid 



Curv< d plates, ninr'.'iiiiil pores. 



Proiipi d teeth, sutural jiores. 



Touch, fleshy girdle, propped teeth. 



Propped teetb, horny girdle pro- 

 cesses. 



Spongy girdle, single lateral slits. 



Broad serrated teeth and sinus, 

 scaly girfile. 



Same, with added side slits. 



Sharper teeth, smooth giidle. 



Shaiper teeth, valves partly cov- 

 ered. 



Non-fissured but deeply pectinate 

 teeth, hair\ girdle. 



Posterior valve "medio fimbriata." 



Non-imliricate scales, broad gioov- 

 ed and serrate teeth. 



Teeth short inside, long outside, 

 waved sinus. 



Same, with ladsioid slits. 



Spinous girdle, lobed sinus. 



Partly covered valves, radsioid 

 slits. 



Downy girdle tufts, smooth sharp 

 teeth. 



Bristly girdle, smooth propped 

 teeth. 



Sharp teeth, striate scales. 



Long, sharp teeth, radsioid slits, 

 posteiior mticro. 



Twisted mucro, smooth, thin girdle, 

 thin ischnoid valves. 



Smooth, porous girdle partly cover- 

 ing valves, very long t( eth. 



Slit tail-plate, scaly girdle. 



Sharp teeth, produced girdle, hi. 

 lobed scales, lobed sinus. 



Very long and narrow, deep slit. 



Scaly girdle, llattened lad plate. 



