. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 133 t»J0 \ C J <u 1600 2400 2000 Depth m. Fig. 15 L. pustulosa pustulosa: The range of shell lengths in individual samples taken with an epibenthic sledge plotted against Station depth. No. N = lll. 1|6 2-4 Shell length mm. 3-2 Fig. 16 L. pustulosa pustulosa: Length frequency histogram of specimens taken at Station Biogas VI DS87. The dashed line marks the minimum size at which gonadial development was observed. Description (Figs 18a & b). Shell, similar to L. p. pustulosa but differs in being slightly mo
. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 133 t»J0 \ C J <u 1600 2400 2000 Depth m. Fig. 15 L. pustulosa pustulosa: The range of shell lengths in individual samples taken with an epibenthic sledge plotted against Station depth. No. N = lll. 1|6 2-4 Shell length mm. 3-2 Fig. 16 L. pustulosa pustulosa: Length frequency histogram of specimens taken at Station Biogas VI DS87. The dashed line marks the minimum size at which gonadial development was observed. Description (Figs 18a & b). Shell, similar to L. p. pustulosa but differs in being slightly more inflated, the overall lateral outline squarer and more 'angular', anterior and posterior dorsal margin proximally straight, dorsal anterior margin curves sharply into broadly curved anterior margin, posterior dorsal margin continuous curve with dorsal margin of rost- rum, tip of rostrum more ventral in position than in L. p. pustulosa, posterior ventral margin more deeply sinuous than in L. p. pustulosa. In general L. p. marshalli appears to have fewer, broader teeth (range: 5-10 on either side of resilium) than L. p. pustulosa (but see p. 125 Fig. 2a) Larval shell length 245 um; maximum observed length mm. The internal morphology is virtually undistinguishable from that of L. p. pustulosa (Fig. 19). The number of gill filaments and labial palp ridges are of the same order in both subspecies. L. p. marshalli possibly has slightly longer gill filaments and larger, broader palp ridges, and the byssal gland appears to be larger. The latter may have some. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Farn, Alexander E. London : Butterworths
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