362 



THE TUBK-NOSED SWIMMERS — TUUINAilES. 



i 



Family PROCELLARIID.y,. — The Petrels. 



The North Amiuieiui geiium of this liimily are lumR'ious, ami may bo distinguished 

 aa follows : — 



PROCBLIiARIINiB. Sfcoiulai il'^' 111 or moiv ; tarsi cuvcnMl with hiiimII liPxii;,'oiial scntiOhv ; 

 claw.H sliiirj), ciu'VimI, iiiorc or Icsi* coinpii'sscd. Lf^'-lMincs sliorti-r than wiii<;-)NincK ; 

 CL-rvico-ilorsuI vi-rtcbnu not Ilmii tliaii •2'2 ; IuiniI ])Lalaii.\ of miildlu tuu tsliortvr thun llie 

 next two joints, tonillier. 



A> Si/i? vi'rv larj,'i' (wIiik. 17.(H) inclies or moiv)- Bill longer than taimis. 



3. OHifraga. Tail of sixtct-n fi-atiicrs ; Mil lonj,'('r than the tarsus, very stout ; nasal tuln; 



iniK-li lou'r^cr than thiMnaxillary un^'uis, thv nasal oiiUcesin^'lu at tliu entrance, the Ht-ptum 

 hL>iii<{ hiilddi. 

 B. Si/.i' niiMlinni (win^' less than It.' u lies, ami inort; than 7.<mi). liill shorlir than tarsiw, 



4. Fulmarua. Tail of twelve to liuiteen feathers ; hill very stout ; nasal tuhe nunh shorter 



than the un^'uis, Hti-ai}{ht on top ; nntxillary un^uiii sei>arated from the ntiiial tulie by a 

 very narrow space. 

 fi. Priocella. Similar to Fulwiintu, hut hill nnich more slender, the nasal tube coiicuve un 

 top, and separated from the unf,'uis by a very wide space. 



6. Prlofinua. Tail-feathers twelve; nasal tuU's about liidf as lonj; as the uiifjuis, and sejin- 



rated from the latter by a s|iace eipial in leii^^th to about two thinls the length of the 

 unguis ; nostrils oiK-niiij; directly anteriorly. 



7. PuCDnua. Tail-feathers twelve; nasal tubes about half as hui^' as the un};uis, and sepa- 



rated from the latter by a space nearly eipud to the length of the unguis ; nostrils o|i«!uiMg 

 obli(|Uely upward. 



8. CBstrelata. Hill much compressed and Miy deep, the ungui very large, o-cupying nearly 



the terminal half of the bill; na.sd IuIh-s short and very prominent, about one ihiitl tu 

 one half as long as the maxillary unguis, the nostrils opening directly in front. 

 0. Bulweria. Similar to (K-ilnlutn, but smaller and more slender, the tail longer (about 



half the wing) ami more grailuated. Mydlogical formula said to lie very dilFerent. 

 1(1. Daption. Tail of fourteen feathers; bill broad and depressed, exce|it terminally, the 

 unguis occu])ying less than one third its length ; nasal luU's depressed and concave in 

 the middle, nearly as long as the unguis, and separated from the latter by a space (npial 

 to al)out two thirds its length ; maxillary rami separated below from the angle luuk, 

 boweil slightly outward, the intervening space occupied with buix! skin; tunuii nnuli 

 longer than the bill, but shorter than the midille toe. 

 C Size very small (wing less than 7.<H) inches). 



11. Halooypteua. Tail much rounded, or slightly graduated ; tarsus decidedly longer than 

 the middle claw (abcait twice the culnu'U) ; no white on the rump. 



12. Prooellarla, Tail even or slightly rounded ; tarsus about ei|ual to the middle Iih; ninl 

 claw (about twice the culmen); a white patch on the rump. 



13. Cymooborea. Tail much forked; tarsus abniit as long as, or a little shorter than, tin' 

 middle toe and claw (about one and a half times as lung as theculnien) ; with or without 

 a white rump |NUch. 



14. Ooeanodroma. Tail forked, the feathers siallopcd at the end, the lateral rediicc- 

 narrowed termimdiy ; tarsus about eijual to, or very little shorter than, the middle toi- 

 and claw (not ()uite twice as long as the cuhueii) ; no white on the rump. 



OCEANITINJB. Seciuidarii-s 10 ; tarsi ocnmte, or else covered in front with largo obliiiucly 

 transverse scutes ; diws Hat and broad. Leg-bones longer than wing-bones ; cervicn 

 doi-s<d vertebriu '2\ ; Ixtsal phalanx of middle toe longi r than the next two together 

 Nasal aperture single, circular 



JHlL 



