. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 348 Mr. C. T. Eegan on the Anatomy and very large and pharynx very distensible; upjDer border o£ mouth formed by a single pair of slender bones (praj- maxillo-maxillaries) meetin'X anteriorly and with their distal extremities attached within the qnadrates, connected by a loose membrane anteriorly with a moval^le ethmoidal ros- trum and for tlie greater part of their length with the suspensorium ; lower jaw of dentary, articulare, and angulare ; mandibular rami slender, loosely
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 348 Mr. C. T. Eegan on the Anatomy and very large and pharynx very distensible; upjDer border o£ mouth formed by a single pair of slender bones (praj- maxillo-maxillaries) meetin'X anteriorly and with their distal extremities attached within the qnadrates, connected by a loose membrane anteriorly with a moval^le ethmoidal ros- trum and for tlie greater part of their length with the suspensorium ; lower jaw of dentary, articulare, and angulare ; mandibular rami slender, loosely united at the symphysis and connected by a broad distensible membrane; suspensorium long and directed obliquely backwards, of two bones, iiyomandibular and quadrate, which are movably articulated ; opercular bones absent and brancliiostegals vestigial; branchial arches and pectoral arch far behind the head, with skeleton reduced and little ossified. Skull with much cartilage, the membrane bones very thin ; parietals meeting in front of the small supraoccipital ; no exoccipital condyles. Vertebral centra co-ossified with arches, which are reduced, the neural arches appearing as paired, erect, spine-like processes ; no ribs. No air-bladder. Gonoducts normally developed {fide Zug- mayer). The whole structure of the Lyomeri is quite unlike that of the Apodes ; in my opinion they may well have been derived from Iniomi such as the Synodontidce, which approach them in the short snout, wide mouth, oblique suspensorium, &c. (c/. Ann. & Mag. Nat. Hist. (8) vii. 1911, p. 121). SOC ^ya elJi- ^^ -spo,^ / ^^OC -pto-\- / ' epo- ->^ SOC"-' Diagrams of upper surface of skull in A. Qastrostomus bairdii, B. Sacco- a?nptiUaceus, and C. Saui'ida nebiilosa. (A after Ziig-mayer's iijzure, modified by omission of sutures that appear to subdivide the froutals.) eth, mesethmoid; leth, lateral ethmoid ; /, frontal; p, parietal; spo, sphenotic; ptu, pterotic; ejio, epiotic
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