384 



Bashford Dean MemoriaJ Volume 



Text-figure 55. 



Lateral view of the trunk musculature of ChlamydoseJachus in four different regions : A, anterior part of the 



trunk: B, middle part: C, posterior part; and D, anterior portion of the tail. 



a, b, c, d, the four longitudinal divisions of the ventral bundle (ventrolateral of other authors); al (alpha), he (beta), and ga (gamma), 

 the three longitudinal regions into which the division h may be divided; I, lateral line; o. inf., muscuius obliquus inferior; o.s., musculus 

 obliquus superior; R-p., rectvis profundus muscle — in A it is shown artificially spread out, as well as in its original pc^tion, inrolled. 

 A line drawn from x to y, along each region, would separate, approximately, the inferior oblique from the superira: oblique musdes. 



After Maurer, 1912, Fig. 1, Taf. 1. 



Maurer (1912) has given us detailed infonnation concerning the trunk musculature 

 of both Chlamydoselachus and Heptanchus. In Chlamydoselachus (Text-figure 55 1 the 

 ventrolateral bundle has the same fundamental division into two columns (di\'ided 

 otherwise by Maurer) as is found in the dorsal bundle. This is best exemplified in the 

 region of the base of the tail (Text-figure 55d; where the ventrolateral bundle is the 



,-!*?-- 



Sr— 



'"'-,-«- J^^ ^S^ - ~ 



r-rl//.'.'^ ff/'. 



'^BU:^'^^ 



Text-figure 56. 



Lateral view of the trunk musculature of Yizptamims d-nereus. 



a., dorsal region of ventral bxmdle (ventrolateral of other authors); d., dorsal bundle; I., lateral line; o.inf., inferira: 



oblique; o.m. x o.s., portions of middle oblique and superior oblique overlapped by inferior oblique: o.s.. superior 



oblique; S, shoulder girdle. 

 After Maurer, 1912, Fig. 4, Taf. 2. 



